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-   -   External holding tank (http://www.trawlerforum.com/forums/s31/external-holding-tank-47000.html)

ChattyPatty 10-09-2019 10:56 AM

External holding tank
 
I just ordered a Camco Rhino heavy duty portable holding tank. Anyone have experience with an external holding tank? I donít like boating to the pump out station in the rainy, windy winter here. Anyone have experience with attaching it to the boat and pumping it out? Special fittings and or pump needed?

Comodave 10-09-2019 11:11 AM

Quote:

Originally Posted by ChattyPatty (Post 809621)
I just ordered a Camco Rhino heavy duty portable holding tank. Anyone have experience with an external holding tank? I donít like boating to the pump out station in the rainy, windy winter here. Anyone have experience with attaching it to the boat and pumping it out? Special fittings and or pump needed?

Welcome aboard. Have never used one of those. You are going to need some kind of pump to get it from your holding and up into the portable tank. Do you have an overboard pump that lets you pump the holding tank into the water when you are offshore at least 3 miles? If you do you may be able to add a Y valve and a hose that will pump the waste into the holding tank.

alormaria 10-09-2019 11:43 AM

Yuck!!

djmarchand 10-09-2019 11:53 AM

RVs can do all of the transfer in and out of an external tank with gravity. That is what the Camco tank is designed to do.

As others said you will need a pump, probably a macerator pump if you already have on installed with a Y valve to divert its output to the external tank. Then you will need about 20' of waste hose from the pump to the tank. Maybe collapsible RV waste hose could work. And then you need to vent the tank. And finally you will need a remote switch to control the pump so you don't blow up your tank once it gets full.

And then you need to wash down your hose- overboard? when you are finished with it.

I would prefer just to get a little wet occasionally.

David

koliver 10-09-2019 12:02 PM

Quote:

Originally Posted by djmarchand (Post 809637)
RVs can do all of the transfer in and out of an external tank with gravity. That is what the Camco tank is designed to do.

As others said you will need a pump, probably a macerator pump if you already have on installed with a Y valve to divert its output to the external tank. Then you will need about 20' of waste hose from the pump to the tank. Maybe collapsible RV waste hose could work. And then you need to vent the tank. And finally you will need a remote switch to control the pump so you don't blow up your tank once it gets full.

And then you need to wash down your hose- overboard? when you are finished with it.

I would prefer just to get a little wet occasionally.

David

Collapsible RV hose has no place on a boat. It scarcely has any place on an RV. Walls are thin, subject to tearing, corrugated insides hold solids long after any other hose would be clean, ....you get what I am saying.

Comodave 10-09-2019 12:28 PM

We have a macerator in our RV to pump the waste out and even uphill if need be. It takes 1Ē retracting hose. The 1Ē hose is pretty tough. We have about 60í of it and it stretches out easily. Maybe look at Camping World for the hose. Still it would be a mess to store. We leave our hooked up permanently.

koliver 10-09-2019 01:46 PM

Getting the right idea. Your Marine supply will have better hose than the Camping World stuff. You only need to match the fitting size. I too use the 1Ē on my RV. Easy to clean and store. 1Ē marine hose will fit your macerated but not likely your Y. Then the tank will have an RV size fitting you will need to match or change. Good luck!

jleonard 10-09-2019 02:55 PM

How are you going to keep it from freezing?

HeadMistress 10-09-2019 04:09 PM

If you're gonna have to lift and carry it, you need to know that water and waste weigh 8.333 lbs/gallon. Even a 5 gal portapotty tank weighs almost 50 lbs full. I dunno what size you ordered, but the smallest Camco tank I could find online is 21 gallons, so even if only half full it would weigh at least 100 lbs including the weight of the tank.

Methinks that you'd only have to go through what it would take to use the Camco tank once to convince you that having to put on foulies to go the pumpout, or maybe go when the weather isn't sour even if the tank isn't full yet, isn't such a bad idea after all. Or maybe put a 2-3 gal portapotty aboard to use in an "emergency" till you can get to the pumpout. Its tank weighs only about 30 lbs, which you could carry to the marina bathroom to empty it into a toilet.

--Peggie

rslifkin 10-09-2019 04:12 PM

What size boat are we dealing with and how big is your holding tank? Would it be possible to just put in a bigger tank so you don't have to get pumped as often (making it easier to do it in good weather)?

kchace 10-09-2019 04:47 PM

Transferring waste to a "portable" holding tank, and THEN taking that tank someplace to empty it sounds much closer to a port potty and NOT much fun at all.

psneeld 10-09-2019 05:13 PM

What many forget on TF is the old expression "where there is a will, there is a way".


Sure waste is yucky to some, yes it's weight is 8 lbs per gallon, yes rolling a cart is less work to some than moving a boat and vice versa, yes watching falling temps and frozen waste is an issue....


BIG Fing deal.....think through it and make it happen if you want....it can be done as I have thought it through too.... it also has issues you have to overcome.


No one can lay out what works best unless they sit down with you and go over the whole situation. But don't let a bunch of people who don't want to either do it or think it through deter you.

ChattyPatty 10-09-2019 06:49 PM

Quote:

Originally Posted by jleonard (Post 809683)
How are you going to keep it from freezing?

We donít get a lot of freezing here but we can possibly insulate as needed

ChattyPatty 10-09-2019 06:57 PM

Quote:

Originally Posted by psneeld (Post 809718)
What many forget on TF is the old expression "where there is a will, there is a way".


Sure waste is yucky to some, yes it's weight is 8 lbs per gallon, yes rolling a cart is less work to some than moving a boat and vice versa, yes watching falling temps and frozen waste is an issue....


BIG Fing deal.....think through it and make it happen if you want....it can be done as I have thought it through too.... it also has issues you have to overcome.


No one can lay out what works best unless they sit down with you and go over the whole situation. But don't let a bunch of people who don't want to either do it or think it through deter you.

We have been thinking it through for a while before I ordered this morning. It will be a challenge but all of the replyís have given us more info than we have thought about. But knowing is half the battle. (GI Joe!!!!) not sure how many will get that reference! 🤣

ChattyPatty 10-09-2019 07:10 PM

Quote:

Originally Posted by HeadMistress (Post 809696)
If you're gonna have to lift and carry it, you need to know that water and waste weigh 8.333 lbs/gallon. Even a 5 gal portapotty tank weighs almost 50 lbs full. I dunno what size you ordered, but the smallest Camco tank I could find online is 21 gallons, so even if only half full it would weigh at least 100 lbs including the weight of the tank.

Methinks that you'd only have to go through what it would take to use the Camco tank once to convince you that having to put on foulies to go the pumpout, or maybe go when the weather isn't sour even if the tank isn't full yet, isn't such a bad idea after all. Or maybe put a 2-3 gal portapotty aboard to use in an "emergency" till you can get to the pumpout. Its tank weighs only about 30 lbs, which you could carry to the marina bathroom to empty it into a toilet.

--Peggie

we have a 34í Trawler. Itís a challenge to maneuver this marina and weíve had a couple incidents and decided not to motor to pump out for the winter. I donít like walking out in cold rain to use the Marina head several times a day. Rolling my waste tank once every 10-15 days to pump out would mean being wet and cold only once in the day. The Camco tank we purchased is a 36 gallon tank. Our holding tank is 40 gallons. Even at that weight the Camco would pull easily with a towing dolly.

Comodave 10-09-2019 07:43 PM

Buy a lot of disposable gloves...

psneeld 10-09-2019 07:45 PM

Or be careful and wash your hands afterwards. :)

ChattyPatty 10-09-2019 08:15 PM

Quote:

Originally Posted by psneeld (Post 809765)
Or be careful and wash your hands afterwards. :)

Thanks! We hold stock in disposable gloves lol. :rofl:

Maerin 10-09-2019 11:18 PM

Quote:

Originally Posted by ChattyPatty (Post 809746)
We donít get a lot of freezing here but we can possibly insulate as needed


Keep in mind that insulating won't prevent freezing in a tank exposed to freezing conditions. It may slow the process, but without a source of heat, it'll eventually freeze, insulation notwithstanding. If the tank spends any time in freezing conditions, you may need to add a heating pad. Then the insulation will help to retain the heat.

ChattyPatty 10-10-2019 12:03 AM

Quote:

Originally Posted by Maerin (Post 809819)
Keep in mind that insulating won't prevent freezing in a tank exposed to freezing conditions. It may slow the process, but without a source of heat, it'll eventually freeze, insulation notwithstanding. If the tank spends any time in freezing conditions, you may need to add a heating pad. Then the insulation will help to retain the heat.

Good point. We will be prepared just in case.


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