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Old 09-08-2014, 08:00 PM   #101
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The yard told me that a goodly amount of sediment and vegetative matter made its appearance during the initial flushing process.
This will prove to be the problem area. Diesel can easily be cleaned off of stainless assuming you have good access to it. But areas that have sludge in them, will prove to be harder to clean and remove diesel from. Hopefully, the yard has good access to the tank and can visually inspect all surfaces inside the tank, regardless of baffles.

Dwhatty, I would suggest you personally inspect the inside of the tanks before they button them up.
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Old 09-08-2014, 08:09 PM   #102
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If I had sludge in my water tank...I'd either clean it pretty well this go around or toss it anyway...not like it's a fuel tank that I would want clean too... but less of a big deal to me...

and I'm as far from a germophobe as they get.....
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Old 09-08-2014, 08:19 PM   #103
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Well, what's the "approved" method for venting water tanks? Flooding out the deck fill isn't a great solution if contaminants can get back in, and I'm not really thrilled about additional hull or deck penetrations.
I don't know what is "approved" when venting water tanks (or any other onboard tank for that matter), but all of our tanks - fuel, water, and holding - have vents that exit well up the hull; our previous boat had the same arrangement.

When I'm filling our water tanks I simply await the water gushing from the vent to tell me that the tanks are full.

I am curious though; when you are filling your water tanks where does the air go that is being displaced? Through the sight glass tube?
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Old 09-08-2014, 09:01 PM   #104
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Dwhatty, I would suggest you personally inspect the inside of the tanks before they button them up.
I'll crawl right into it tomorrow. Have the jaws of Life handy.
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Old 09-08-2014, 11:03 PM   #105
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I've seen sight glasses with the top open to atmosphere but never on a boat. If the tank overfills you don't want the contents in the bilge, even if it is only water. Or a full tank in heavy seas could also spill out the top of the sight tube.
Good mental exercise figuring this one out.
Mine are only connected at the bottom and the top end of the sightglass tube has a breathable filter on it. The tube extends above the top of the tank and above the fill cap, thus, when the tank is full it overflows from the fill port onto the outer deck NOT out the top of the sight glass tube. This was a factory installation. FYI
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Old 09-09-2014, 12:23 AM   #106
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Greetings,
As far as the cleaning and testing goes, I would suggest an immediate lab test after the yard does their thing AND another test after say a week or two after the water has been sitting in the system for a while.
I agree, but the only way to tell for sure is to use the cleaned tank water for a couple of colonics on the Yard Manager. Then feed him two four-bean burrittos. If there's any diesel odor, start over. (Don't try this at home.)
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Old 09-09-2014, 01:39 AM   #107
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Did I mention that the service manager is my next door neighbor. He knows I know where he lives.
And vice versa.
Fixing up when you (for want of an unfiltered word) mess up is the mark of a good yard. My guy did it, instantly, no prodding, and it involved hauling out. He got respect and forgiveness. I hope it ends well, sounds like it.
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Old 09-09-2014, 01:52 AM   #108
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Mine are only connected at the bottom and the top end of the sightglass tube has a breathable filter on it. The tube extends above the top of the tank and above the fill cap, thus, when the tank is full it overflows from the fill port onto the outer deck NOT out the top of the sight glass tube. This was a factory installation. FYI
Interesting - thanks for the info.

Always liked the Great Lakes 33.
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Old 09-09-2014, 11:18 AM   #109
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I am curious though; when you are filling your water tanks where does the air go that is being displaced? Through the sight glass tube?
I think it's coming out the filler hole on the top of the tank, and now that I think about it, when it's full water probably comes out there rather than the sight tubes - still triggering the bilge pump ;-)

But your question just makes me realize that I need to do a little more research into what I have - and I'm still interested in ideas of what I SHOULD have.
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Old 09-09-2014, 01:26 PM   #110
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Happened to me once. Some moron put fuel in the water tank. So, replaced the tank and lines up to and including the water pump. Lines past the pump didn't have any problems as no one had run the water. I believe it was on the Wellcraft, where the water fill and fuel fill were side by side, and looked identical. Well, they weren't after that incident.
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Old 09-09-2014, 03:56 PM   #111
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I will build one of these for each of my water tanks.

Building a Holding Tank Filter - BoatingHowTo.com

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Old 09-09-2014, 04:36 PM   #112
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Well, hopefully the saga is now finally over.

Two days of fuel removal and steam cleaning. Flushing, detergent, flushing, detergent, all repeated and repeated and repeated and repeated............. denatured alcohol flush.

"Complimentary" inline water filter installed.

The mechanic (who I have for the moment nicknamed "BP") and his helper drank the water. I drank it. It tastes good to me and no smell. I mixed it with a celebratory Bourbon. Even better.

After a few days of using the water (I think for the moment, we'll use bottled water for drinking) I'll send off a sample for a water test, including a test for hydrocarbons.

Tomorrow we leave the Yard. Back into boating for the first time since August 18th. We'll maybe get three or four weeks use of it, if the weather holds, before having to haul out for the winter.

Happy boy here.
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Old 09-09-2014, 04:36 PM   #113
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I don't THINK you really want to do that, Ben. Holding tanks are waste holding tanks, not water tanks....and holding tank filters are made to go into the holding tank vent line. Their sole purpose is to trap odor forced out the tank vent when the toilet is flushed. ....they have no purpose in a water tank vent line, nor do they have any water "purification" qualities. In fact, I wouldn't want a DIY filter stuffed with any old off the shelf activated charcoal that may have been anywhere, exposed to who knows what airborne bugs, in my potable water system and I wouldn't think you would either.

Holding tank vent filters should only be a last resort in a waste tank vent line, 'cuz they actually help to create the problem they're sold to solve..they impede the exchange of fresh air via the tank vent that's needed to keep the tank aerobic, thus preventing any odor from forming. Modify the venting or aerate the contents to maintain an aerobic tank and you won't need any filters.
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Old 09-09-2014, 04:50 PM   #114
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I don't THINK you really want to do that, Ben. Holding tanks are waste holding tanks, not water tanks....and holding tank filters are made to go into the holding tank vent line. Their sole purpose is to trap odor forced out the tank vent when the toilet is flushed. ....they have no purpose in a water tank vent line, nor do they have any water "purification" qualities. In fact, I wouldn't want a DIY filter stuffed with any old off the shelf activated charcoal that may have been anywhere, exposed to who knows what airborne bugs, in my potable water system and I wouldn't think you would either.

Holding tank vent filters should only be a last resort in a waste tank vent line, 'cuz they actually help to create the problem they're sold to solve..they impede the exchange of fresh air via the tank vent that's needed to keep the tank aerobic, thus preventing any odor from forming. Modify the venting or aerate the contents to maintain an aerobic tank and you won't need any filters.

Ok.Thanks for the info.
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Old 09-09-2014, 05:11 PM   #115
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Greetings,
OK, first things first: MY opinion only. Mr. dw. Good to hear the yard did the right thing. I might suggest when you send your sample off to analysis, you draw it right from the tank or bypass the "courtesy" filter completely. What you want is a TRUE sample, not one which has been filtered (I suspect one of the purposes of the filter may be to eliminate any trace hydrocarbon contamination).
Mr. b2. Listen to Ms. HM. She KNOWS about these things. I fully agree with her as to the non use of a sewage vent filter. What you want is a happy aerated colony of LIVE microbes munching down on last nights tacos. The fact that many newer boats come with a vent filter factory installed suggests to me a band-aid fix for a poorly designed sewage system that doesn't allow enough oxygen (air) into the holding tank to keep the hungry little buggers alive and well.
As far as the filter on the water tank vent...We bleach our water tank on a regular basis and thus far have suffered no ill effects but YOUR call completely.
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