Overboard discharge of holding tank.

The friendliest place on the web for anyone who enjoys boating.
If you have answers, please help by responding to the unanswered posts.
See posts with no answers
dhays said:
Unfortunately, there have been repeated movements to have all of Puget Sound declared a ND area. They have not yet been successful, but I am afraid that they will be soon. If it weren't for that concern I would be very interested in a type I system.
Click to expand...

Only about 5% of boats ever have or are likely to have a treatment device...so if enough people decide against buying one out of fear they won't be able to use it, the enviro-zealots don't need to succeed in getting NDZ legislation passed to turn any body of water into a de facto NDZ. They win the battle without ever firing a shot.

The sad thing is, even with plenty of available affordable pumpouts, more tanks are dumped than pumped. All those macerator pumps on boats in waters too far from open ocean beyond 3 miles to ever use 'em legally are ample evidence of that.

Peggie
http://www.amazon.com/New-Get-Rid-Boat-Odors/dp/1892399784/
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein
 
The cities around the bay pollute the water, not the boats in the bay.

Sewage - Chesapeake Bay Foundation Blog

We in Hampton had millions of gallons of raw sewage pouring into the back river this past summer from a broken pipe.
But see, they love to blame and slam all the boaters. If every boater simply discharged into the water, compared to the cities, it is meaningless by comparison. Maybe it makes good politics politically correct thinking.

And where I boat, are not very many fish anymore. You go out to the ocean to catch fish. The bottom of the bay has collected all the effluent of the surrounding cities and is mostly dead of fish.
 
Last edited:
psneeld said:
I am still hung up on 33 CFR 159.12a(c) that discusses that a holding tank doing its job under ambient temp and pressure (typical trawler) need not met any other requirements of part 159 such as the level indicator.
Click to expand...

You did manage to get into the weeds after all...<sigh>...

Not any part anywhere in part 159...

Elsewhere in 33 CFR 159 you'll find requirements for the mfrs of Type I and II MSDs (treatment devices)...including that they must be submitted to the USCG for certification and every unit must be made exactly like the one submitted. Any changes, they must be resubmitted for certification.

33 CFR 159.12a relieves the USCG of the burden having to certify every container someone wants to sell as a Type III (holding tank) by automatically certifying any device that's "designed to prevent the overboard discharge of treated or untreated sewageor any waste derived from sewage" and "is used solely for the storage of sewage and flushwater at ambient air pressure and temperature" as a Type III. And states that a any device that meets those two conditions doesn't have to meet any other conditions to be automatically certified as a Type III.

And that's the only thing that 33 CFR 159.12a addresses.

Peggie
http://www.amazon.com/New-Get-Rid-Boat-Odors/dp/1892399784/
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein
 
HeadMistress said:
You did manage to get into the weeds after all...<sigh>...

Not any part anywhere in part 159...

Elsewhere in 33 CFR 159 you'll find requirements for the mfrs of Type I and II MSDs (treatment devices)...including that they must be submitted to the USCG for certification and every unit must be made exactly like the one submitted. Any changes, they must be resubmitted for certification.

33 CFR 159.12a relieves the USCG of the burden having to certify every container someone wants to sell as a Type III (holding tank) by automatically certifying any device that's "designed to prevent the overboard discharge of treated or untreated sewageor any waste derived from sewage" and "is used solely for the storage of sewage and flushwater at ambient air pressure and temperature" as a Type III. And states that a any device that meets those two conditions doesn't have to meet any other conditions to be automatically certified as a Type III.

And that's the only thing that 33 CFR 159.12a addresses.

Peggie
http://www.amazon.com/New-Get-Rid-Boat-Odors/dp/1892399784/
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein
Click to expand...
You are repeating what I already know...

Because it doesn't refer to other specific sections, it just broad stokes any other regs in this part......I am not sure why doesn't that include the monitoring.

You don't have to respond as I am in the weeds, plus Iwill be checking directly with the USCG next week....it just is not clear to me and has others not seeing it so clearly either.
 
Last edited:
Given the rain here this weekend, I came down to the boat to spend some quality time with my holding tank. I have the Sealand Tankwatch 4 system on my current boat. This is a display that has 4 lights, one each for Empty, Low, Mid, and Full. In the 6 months that I have owned it I have only seen the Empty light flash once briefly and that was in some rolling conditions after (legally) discharging the tank in Georgia Strait. The rest of the time the display has shown Low, then when the tank is about 1/2 full it shows Mid, then finally Full when it really is full.

I pulled off the cover of the tank and checked that each of the three floats was working properly. They were. They weren't clogged with crap (I have a fondness for alliteration) and weren't all that dirty. When I lifted up the deepest probe then the empty light would illuminate. My assumption is that when the Low probe was installed, it was cut too long. I released the compression fitting on the tube and raised it another inch. My hope is that the next time the tank is pumped that it will actually show Empty and then Low when the tank is about 1/4 full. I also raised the Mid probe about an inch in the hope that it will light the indicator when the tank is closer to about 3/4 full. My thought is that it will give me a little more information, such as "as soon as the Mid light is illuminated I need to find a pump out that day or the next.

I did discover that it is possible to adjust the lengths of the probes to some degree without having to open up the tank.
 
HeadMistress said:
The discharge of treated waste from your ElectroScan is legal everywhere in your waters--actually everywhere on the whole west coast north of Santa Barbara except for one small harbor off SF Bay (Richardson Bay) and a few misguided marinas in WA and several provincial park anchorages in BC...so you should only have to use your tank so rarely that even 10-15 gallons should be more than adequate.
Click to expand...

When we are in marinas and anchorages that ask we not discharge I make an effort to follow their rules as a courtesy. I do not utilize the holding tank while we are underway.
 
HeadMistress said:
............. The sad thing is, even with plenty of available affordable pumpouts, more tanks are dumped than pumped. All those macerator pumps on boats in waters too far from open ocean beyond 3 miles to ever use 'em legally are ample evidence of that.
Click to expand...

That's only evidence that the boats were built with macerator pumps, not that people are using them illegally.

And since it's not illegal to poop directly into the water but is illegal if you put the poop in a container first, what's the difference? It's still poop.

In my area, boat ramps don't have toilets. This means that hundreds of people go out on hundreds of boats every summer weekend. Are they going eight to twelve hours without relieving themselves? My bet is, they are not. We watch them dock their boats, climb down the swim ladder into the water, stand there for a minute or two and then climb back out.
 
A couple of comments as we're late to this exciting thread. First, I don't care whether it's required or not, or how fancy or simple, but I would always want some means of knowing how full all my tanks are-fuel, water, and holding.

Second, when cruising inland, there are always plenty of pump out stations available. It's just a matter of taking time to use them. The boat we're looping on has what I'd consider an undersized holding tank at 36 gallons. We pretty much pump it every day. 36 gallons for 3 heads (4 with crew cabin), typically 6 people or so aboard, isn't much. We greatly appreciate those marinas that have portable equipment and pump out where you're docked as opposed to you having to move to a station.

Third, when cruising along the coast, we almost never have a day we cruise and don't go 3 nm off shore so we discharge any time we cruise. Now, I know many here just stick to the ICW so face the challenge we face inland.

We just consider fuel, water, and holding tank as three items to monitor and to plan to take care of regularly as needed.
 
That's only evidence that the boats were built with macerator pumps, not that people are using them illegally.

If you'd spent the last 25 years helping hundreds of people on inland and coastal waters install, trouble-shoot and replace overboard discharge pump, you'd know too that they ARE using 'em illegally. Several years ago someone posted a survey on a brands-specific boat owners site...fewer than 25% checked that they always used a pumpout.

And since it's not illegal to poop directly into the water but is illegal if you put the poop in a container first, what's the difference? It's still poop.

The difference is, there's no way to enforce a prohibition against "direct deposit." If there were, there'd be one.

The real irony in all the marine sanitation madness is, there are only about 12 million registered boats in the US, 90% of which are <20'. Anything smaller than about 23' isn't likely to have even a portapotty. That doesn't leave enough boats with toilets in whole US to put as much sewage into the waters in a year as just ONE major sewage treatment plant spill can put there in a day.
 
HeadMistress; The real irony in all the marine sanitation madness is said:
This is an important point. Unfortunately, rational thought and perspective doesn't usually hold sway. Even so, I honestly don't mind doing my small part in helping to keep my cruising grounds healthy.
Click to expand...
 
Peggie always nails it!

Just don't dump/poop/discharge in any anchorage. Usually they have less flushing (okay, I know) by tidal waters than open areas and there are frequently lots of swimmers. "Doing it" in an anchorage is disgusting. Even doing it stealthily at night, you are a moron and you will go to hell..
 
Funny no mention of gray water being so pristine...:rofl:

All the garbage from galley sinks and who know what is washed off human body parts all day long that drains or gets pumped out into those same anchorages.......:eek:

Hey....didn't I just read a news article that said the radiation from the dsmaged nuclear power plant in Japan finally has found its way through the the entire Pacific?

Maybe bacteria doesn't stand a chance in the water anymore.....:facepalm:
 
Here's a link to the gauge that I fitted, for those who are interested.
I went for the deluxe LCD display version. Lots of graduations, not just a few lights, and as I said no moving parts.

The best part is the price - especially for you at current $/£ exchange rates!
Waste Water Gauge | MCS Boat Products

As I said, I can't believe how difficult some people are making this seem. It's not. You just need to know the depth of your tank, and quote it when ordering, as it's calibrated and made to suit.
 
WesK said:
I have a tank level monitor but it always shows "full" so it's not much use. It uses sensors on the outside of a poly tank but poop sticks to the inside walls of the tank so it shows full. I can manually clean the tank walls and it will work for a short time and then start reading full again.
Click to expand...

HeadMistress said:
I do have a level sensing device. It just doesn't work and unless I can find a way to keep poop from sticking to the inside of the tank, it never will.


You can't keep it from sticking to the walls, but there are products that will remove it...I'm told that NoFlex is one, and that regular applications will prevent it. You have nothing to lose by trying it.
Click to expand...

ranger42c said:
We've been experimenting with Noflex for the last couple years. The verdict is still out... but then part of that is because I don't have easy sight-lines to the tank itself... so don't check it directly very often...
Click to expand...

HeadMistress said:
In marine tanks, it's the animal fats in waste that build up on the wall of the tank. As I posted earlier, NoFlex should take care of that.
Click to expand...




I said earlier that we’ve been using Noflex, but that the verdict is still out --- with respect to tank sidewalls. That’s partly because I don’t often have direct “eyeballs on” the tank, and partly because the last time I was looking at it (had it opened up to replace the tank level gauge sensor), our tank sidewalls weren’t pristine. OTOH, I’ve never tried a Noflex cleaning regime specifically focused on sidewalls, since our gauge sensor is internal, independent of sidewall cleanliness.

But the more I think about it now, the more I’m inclined to think it useful for Wes to try using Noflex in a manner specifically targeted at cleaning the tank sidewalls, given his gauge is external, and given it’d be a relatively easy and cheap solution – if it works.

1) Pump-out, rinse, pump-out, rinse the tank.
2) Fill the tank to normal capacity with fresh water
3) Add the max amount of Noflex (for that size tank/amount of water*)
4) Let it work as long as the Noflex remains active*
5) Pump-out, maybe rinse and pump-out again.
6) Start using the tanks, and assess results

* Learn from Dave Strank the max amount of Noflex, whether it’s safe to add that much all at once, and how long it will remain active. He posts here occasionally...


If that were to work, it'd maybe also be a reasonable tank treatment method for end-of-year or Spring commissioning, too. We've not paid all that much attention to the inside of our holding tank, but for those who must... it'd be useful to know if this is a viable approach or not.


-Chris
 
Last edited:
I can clean the tank walls manually by removing the access plug that I installed for this purpose. It's just that I don't really care to do this and it requires running the macerator (in the marina) to get ride of the waste.


After going to all this trouble a few times to get the level monitor to work, I just said the heck with it.
 
WesK said:
I can clean the tank walls manually by removing the access plug that I installed for this purpose. It's just that I don't really care to do this and it requires running the macerator (in the marina) to get ride of the waste.

After going to all this trouble a few times to get the level monitor to work, I just said the heck with it.
Click to expand...


I wonder if a Noflex flush approach, then followed by the normal daily treatment, would effectively eliminate the problem.

At least cleaning the sidewalls that way -- if it works -- wouldn't require using your macerator.


Easier than changing monitors, maybe. If it works.

-Chris
 
RV supply places sell a spray head to clean RV black tanks...
Nozzle on the that sprays horizontal & rotates.
If you have an access plate or sensor on the top they might assist w the cleaning and rinsing.
 
WesK said:
I can clean the tank walls manually by removing the access plug that I installed for this purpose. It's just that I don't really care to do this and it requires running the macerator (in the marina) to get ride of the waste.


After going to all this trouble a few times to get the level monitor to work, I just said the heck with it.
Click to expand...


It may be the coating on the inside of the sidewalks that is causing the sensor to not function, or maybe it is the material of the tank. I believe that my tanks are fiberglass and appear to be handlayed and relatively thick. They are also painted so I am not sure how well an exterior sensor would work. I believe that sludge can also create more issues with potential odors over time. After looking into my tank this weekend, it appears that my sidewalks look ok but I do have a layer of filth that seems to be adhered to the roof of the tank.

As others have mentioned, it certainly may be worth trying to use the Noflex approach to see if that can take care of the sidewall issues. Gemini Ltd has instruction for using Noflex initially on an existing tank. Essentially they suggest using 1oz of Noflex for every 10 gal capacity of the tank and use the tank normally. My only question about that is that it may not actually help with the upper side walls or, in my case, the top of the tank.

Something that I intend to is to pump out and rinse the tank as I normally do. This means that I will rinse the tank at least twice when I pump out. I will then go back to my home dock, add the recommended amount of Noflex to the tank and completely fill the tank with water from the dock. I will then let it sit for a while (a day or a week since I still am working 5days/week) and then going back to the pump out and once again pumping and rinsing. This should help with the sidewalls and the top of the tank.
 
My tanks are poly and translucent. The sensor kit I installed measures the potable water tank and the black water tank. The potable water part works fine. The black water part works fine if I scrub the wall where the sensor is (for a while).
 
WesK said:
My tanks are poly and translucent. The sensor kit I installed measures the potable water tank and the black water tank. The potable water part works fine. The black water part works fine if I scrub the wall where the sensor is (for a while).
Click to expand...

The Noflex my be worth a try then.
 
This thread has wandered a bit. The "overboard" discharge, in this thread, refers to pumping raw effluent overboard into the water, usually under water. Bad practice unless beyond three miles from shore. However, many systems are set up with a valve which enable tank contents to use the macerator to pump to a shore facility. Our boat has this capability, although we've never used it. The through hull is above water line and has a threaded fitting for a shore hose. A good reason to keep your macerator in good operable condition. Just my 2 cents...
 
dhays said:
As others have mentioned, it certainly may be worth trying to use the Noflex approach to see if that can take care of the sidewall issues. Gemini Ltd has instruction for using Noflex initially on an existing tank. Essentially they suggest using 1oz of Noflex for every 10 gal capacity of the tank and use the tank normally. My only question about that is that it may not actually help with the upper side walls or, in my case, the top of the tank.

Something that I intend to is to pump out and rinse the tank as I normally do. This means that I will rinse the tank at least twice when I pump out. I will then go back to my home dock, add the recommended amount of Noflex to the tank and completely fill the tank with water from the dock. I will then let it sit for a while (a day or a week since I still am working 5days/week) and then going back to the pump out and once again pumping and rinsing. This should help with the sidewalls and the top of the tank.
Click to expand...


Seems useful if somebody (like you) tries it and reports results afterwards. :)

My theory is that the problem with the normal daily treatment is that the sidewalls at any given point don't get any attention until the effluent level rises to that point... and then the Noflex is possibly busy doing more than just sidewall treatment. Filling the tank with freshwater first and then adding a massive dose of Noflex could well work like a champ... but I've not ever heard anyone say so from first-hand knowledge, and I've not had an opportunity to try that with our tank.

Several members in our owner's club report good result with Noflex, but there's usually a flaw in the report:
- Worked great on my hoses! (Did you visually inspect those hoses? No...)
- Worked great on my odor problem! (What was the underlying cause of your odor problem? I dunno...)
- Worked great on my holding tank! (Did you inspect your tank? No...)
And so forth.

One first-hand report, from me, though: When we bought the boat, the bottom of the bowl was discolored, and I wasn't able to clean that to my satisfaction. Some Noflex standing in there for a while did indeed turn that area white again.

Another first-hand report: if you add some Noflex to the bowl of an electric macerating toilet and then flush right away, it'll sound like ground glass going through the macerator. Dave Strank said he's not ever heard of that causing a problem, but it makes me cringe. I therefore usually let the dose dissolve in the bowl first before flushing. Dave Strank said the stuff will remain active "until spent" -- implying even if the powder has dissolved it'll still be useful once it's finally flushed into the holding tank. I hope so, but can't tell (our tank didn't seem super-clean last Fall when I was replacing our sensor). Might have been cleaner than otherwise, but I had no "before" to compare. Adding a BIG dose would maybe be best done backwards through the pump-out discharge, though...


-Chris
 
Last edited:
All very good points Ranger. I will reinspect the interior of the tank after I do it.

I can report that when I got the boat, I was never able to get a rinse of the tank that actually came out "clear". Despite repeated rinses I was still seeing what looked liked chunks of sludge in the clear portion of the pumpout nozzle. After using Noflex for the first time, I got a clear rinse on the second rinse. So this seemed to work well for me but I can't tell you for sure that it simply was coincidence that I happened to use the Noflex after the last rinse that completely cleared my tank.
 
Last edited:
Giggitoni said:
.......... However, many systems are set up with a valve which enable tank contents to use the macerator to pump to a shore facility. Our boat has this capability, although we've never used it. The through hull is above water line and has a threaded fitting for a shore hose. A good reason to keep your macerator in good operable condition. Just my 2 cents...
Click to expand...

I have never seen such a system. The pumpout stations I have seen and used suck the sewage out of the holding tank. And the boats have a deck fitting that comes directly from the holding tank, not the macerator.

Putting sewage under pressure is generally not a good idea.
 
Wes, when a macerator pulls waste out of a tank, how do you think it sends it overboard if not by using pressure?

It's not uncommon for people with trailerable boats to use the macerator pump to empty the tank into the sewer line or septic tank at home through an access fitting. Never seen it set up to do that on larger boats except for those big enough to have tanks that hold hundreds of gallons and are fitted to connect to the sewer when at the dock. I first saw it about 20 years ago on a customer's 125' schooner when we tied up at Fells Point in Baltimore. Sewage tanks connected to the sewer, fresh water delivered by tanker truck.
 
I just checked our 1986 GB42 manual (as built). The above-waterline pumpout to an offshore facility, in addition to below-waterline and deck suction options, was added when the boat was being constructed in Singapore. So, Peggy, here is a first for you :flowers:. It's possible that the original owner, who ordered the boat, requested and paid for this option.
 
Last edited:
HeadMistress said:
I have tank level monitors that don't work well. It shows me the tank is either "not empty" or "full". Yes, I will see if I can pull it out and see what I can do to improve it. My tank construction will not allow an exterior sensor.

If you can pull out the senders, you can replace 'em. The SCAD system has an internal sender...it's sealed in a PVC tube, so it never comes in contact with the tank contents, therefore can never become clogged.
SCAD Internal Sender Instructions

It'll cost you a little less if you buy it directly from the mfr Profile Tank Monitors

Peggie
http://www.amazon.com/New-Get-Rid-Boat-Odors/dp/1892399784/
"If you can't explain it to a six year old, you don't completely understand it yourself." --Albert Einstein
Click to expand...

Got one rom Ferriollo. Drilled a hole in the top of my plastic tank, glued the threaded collar in place, cut the tube to lenght, screwed it in, calibrated to empty and full. Works like a charm. No fouling.
 
My macerator is between the toilet and the black[water tank. Is that unusual? Seems to be preferred. Best to have solids macerated before being sucked out for sewage treatment.
 
HeadMistress said:
Wes, when a macerator pulls waste out of a tank, how do you think it sends it overboard if not by using pressure? ........
Click to expand...

It sucks it to the pump (vacuum). As long as the discharge is into space (the river, ocean, etc.) there is no significant pressure. Reduce the output of the pump down to 3/4 " and hook it to 25' of garden hose and you have pressure.
 
You must log in or register to reply here.

Similar threads

M
Dip-Tube Question
Replies
4
Views
467
HeadMistress
HeadMistress
grahamdouglass
Holding tank pump out
2
Replies
40
Views
5K
Comodave
Comodave
D
Holding Tank Fittings Help w/ discharge
Replies
9
Views
1K
Barking Sands
Barking Sands
Derek
Waste tank Sealand discharge pump question
Replies
18
Views
3K
willd
W
K
carver 36 pump out
Replies
8
Views
1K
Chuck34
C

Latest posts

Back
Top Bottom