Water tank odor

[Paul]

Any hints on getting odor out of water tanks boat is new and haven't used alot of water?

Paul

[Tom P, IMPULSE #233, '86]

Paul,

I found the following info on the net a year or two ago...Has worked fine for me...

I think the source of the data was Peggie Hall, a marine sanitation expert who now has a great book on the market concerning marine sanitation maintenance...If the following didn't come from Peggie, I appologize to the author for not crediting the source...

"#7, Fresh Water Maintenance
Most fresh water system problems--foul odor or taste--don't originate in the tank, but in the plumbing, which is an ideal environment for molds, fungi and bacteria that thrive in damp dark places. Here's the recommended method for recommissioning fresh water systems; this should be done at least annually:

Fill the water tank with a solution of 1 cup (8 oz) of household bleach per 10 gallon tank capacity. Turn on every faucet on the boat (including a deck wash if you have one), and allow the water to run until what's coming out smells strongly of bleach. Turn off the faucets, but leave the system pressurized so the solution remains in the lines.

Let stand overnight--at least 8 hours--but NO LONGER THAN 24 hours. Drain through every faucet on the boat (and if you haven't done this in a while, it's a good idea to remove any diffusion screens from the faucets, 'cuz what's likely to come out will clog them). Fill the tank again with fresh water only, drain again through every faucet on the boat, repeating till the water runs clean and smells and tastes clean.

Remember: cleaning out the tank addresses only the least of the problem...most of the problem occurs in the lines, so it's very important to leave the system pressurized while the bleach solution is in the tank to keep the solution in the lines too.

People have expressed concern about using this method to recommission aluminum tanks. While bleach (chlorine) IS corrosive, the effect of an annual or semi-annual "shock treatment" is negligible compared to the cumulative effect of holding chlorinated city water in the tank for years. Nevertheless, it's a good idea to mix the total amount of bleach in a few gallons of water before
putting it into either a stainless or aluminum tank.

People have also expressed concern about the possible damage by the rubber and neoprene parts in a water pump. Again, the cumulative effect of putting chlorinated water through the pump is more damaging than an occasional "shock treatment." Occasionally, water pumps have been known to fail after recommissioning, but they've always been older pumps; recommissioning only "pushed 'em over the edge" a month or so sooner than they'd have failed anyway--which I consider preferable to finding yourself without water during the second week of a 3 week cruise.

To keep the water system cleaner longer, USE your fresh water...keep water flowing through system. The molds, fungi, and bacteria only start to grow in hoses that aren't being used. Before filling the tank each time, always let the dock water run for at least 15 minutes first...the same critters that like the lines on your boat LOVE the dock supply line and your hose that sit in the warm sun, and you don't want to transfer water that's been sitting in the dock supply line to your boat's system. So let the water run long enough to flush out all the water that's been standing in them so that what goes into your boat is coming straight from the water main.

Finally, while the molds, fungi and bacteria in onboard water systems here in the US may not be pleasant, we're dealing only with aesthetics...water purity isn't an issue here--or in most developed nations...the water supply has already been purified (unless you're using well-water). However, when cruising out of the country, it's a good idea to know what you're putting in your tanks...and if you're in any doubt, boil all water that's to be drunk or used to wash dishes, and/or treat each tankful to purify. It's even more important in these areas to let the water run before putting it in the tank-wash the boat, whatever it takes...'cuz any harmful bacteria will REALLY proliferate in water hoses left sitting on the dock.

Tom P.

[Paul Erb]

Thank You for the info should I do this even if the tanks are new I never noticed it on my C28 when that was new. I had even heard fro  a friend to run Vodka through the tank.  Has anybody ever heard of that

[Stu Jackson]

Darn, I really liked the vodka idea.

Anybody tried rum?