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Old 08-30-2015, 11:48 AM   #21
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Is there an internet link to what the NMMA or ABYC recommendations for holding tanks?

I looked but didn't find one.

I would be curious to exactly what they say...kinda like the ABYC thoughts on soldering. There is both sides to that coin with certainly some reasonable discussion to be had.
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Old 08-30-2015, 12:39 PM   #22
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If that tank is Al and not leaking, I bet it is coated.

I would not cut that tank out unless it verified to be leaking. Stink can come from many things besides a tank leak.

That's why I put all my holding tank and pump stuff in the engine room.
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Old 08-30-2015, 12:41 PM   #23
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Originally Posted by ksanders View Post
Peggy, I for one really apreciate your insite, knowledge and participation. Regardless of what a very few people seem to indicate, you are the foremost expert on marine sanitation, and your advice is very much apreciated and listened to by the vast majority of the membership here.
X2.
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Old 08-30-2015, 12:42 PM   #24
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RickB, I guess "They is Me". To me there is a difference between an aluminum tank that is coated with epoxy inside and one that has black water in contact with the aluminum. Unfortunately a lot of boat builders use uncoated aluminum tanks.

I can tell you that I've run across a lot of leaking aluminum black water tanks. I didn't cut them open so I don't know if they were epoxy coated.

Even aluminum fuel tanks will develop leaks if water is allowed to accumulate in them. As with black water tanks, the leaks usually develop in the welds first.

I don't like uncoated aluminum tanks for drinking water either. Not that they leak, they make the water taste metallic. I did cut open an aluminum water tank once. Yuk! It had white stuff growing out of the aluminum. It looked like corrosion. I don't know what it was but I didn't want to drink it. I know a lot of people are happy with aluminum water tanks but I personally prefer plastic or fiberglass water tanks.
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Old 08-30-2015, 12:46 PM   #25
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Originally Posted by ksanders View Post
Peggy, I for one really apreciate your insite, knowledge and participation. Regardless of what a very few people seem to indicate, you are the foremost expert on marine sanitation, and your advice is very much apreciated and listened to by the vast majority of the membership here.
Well said.
x3.......
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Old 08-30-2015, 02:07 PM   #26
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[QUOTE] Peggy, I for one really appreciate your insight, knowledge and participation. Regardless of what a very few people seem to indicate, you are the foremost expert on marine sanitation, and your advice is very much appreciated and listened to by the vast majority of the membership here.[/QU0TE]


Well said...

but just as an aside, our trawler was built in 1985 with a stainless steel head tank as well as stainless steel water and fuel tanks.... and so far no problems, no smells and no leaks!
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Old 08-31-2015, 09:21 AM   #27
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This is what I got from the Island Packet folks when I asked about my black water tank:

Your tank is lined with epoxy, but you still need to take care if it to ensure a long life.

Bleach (chlorine) is a big no-no in aluminum tanks. But sometimes folks add
it trying to kill the smell. Don't do it! Some chemicals are made for
deodorizing and are labeled as safe for aluminum.

If you are actively using your holding tank, try and pump it out at least
every two weeks, once a week if possible. And add fresh water and pump
again a couple of times to effectively rinse the tank.

Just FYI if anyone is interested.
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Old 08-31-2015, 11:18 AM   #28
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That sounds like good news. The prime suspect now becomes the hoses so do Peggie's rag test on the hose. It's still possible you have a tank leak but it's less likely. Nice that IP replied so quickly with useful information.
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Old 08-31-2015, 07:53 PM   #29
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Yes. Will do the "hose test"

Actually, since I pumped out and cleared the vent and flushed the tank, it's not smelly anymore!

Maybe I fixed it!
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