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post #11 of 28 Old 05-21-2014
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Re: Keeping fresh water from fouling

Lancelot

Don't add the non-toxic 'pink stuff' thinking it kills bacteria. Some brands do contain some alcohol but not enough to be useful.

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post #12 of 28 Old 05-21-2014
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Re: Keeping fresh water from fouling

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Lancelot

Don't add the non-toxic 'pink stuff' thinking it kills bacteria. Some brands do contain some alcohol but not enough to be useful.

Ronbo
Please read the upcoming article in Practical Sailor regarding winterizing. There is much misinformation out there.

a. Ethanol is NOT a sterilizing agent. It is no better a biostat than glycol. Logically this is obvious; if ethanol killed bacteria at low concentrations (winterizing fluids are typically 24%) then wine would not go bad. It does. So does any ethanol spirit if diluted to 20%.

b. Both PG and ethanol are effective agents above 24%. However, that means you must get ALL of the water out of the system and test the PG coming out the other end. The WARMER the climate the more important this is (bacteria like warm).

c. NEVER put glycol in the tank. Drain the tank, vac it out, and let it dry. ONLY place glycol in the lines (you may need to add a Tee and a valve).

d. Ethanol-based fluids AND vodka are quite corrosive, specifically to brass. There are aditional flaws to using vodka, which you can read up on. Bad idea.

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post #13 of 28 Old 05-22-2014 Thread Starter
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Re: Keeping fresh water from fouling

The following info was taken from a posting found in Fresh Water System Recommissioning as shown in Post #10. I think it's Peggy Hall's suggestion and while I think it's good advice to shock the system and then be careful about not letting the chlorine remain in the tanks for too long a time, I found it interesting that there might be a cummulative negative effect of long term use of chlorine in small concentrations. Plus it was implied that the chlorine in small concentrations would not be beneficial to keeping the water from fouling. Here is the quote:

"People have expressed concern about using this method to recommission aluminum tanks. While bleach (chlorine) IS corrosive, it’s effects are cumulative. So 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 potential damage to rubber and neoprene water pump parts. Again—the cumulative effect of carrying chlorinated water is far more damaging over time than the occasional “shock treatment.” And it’s that cumulative effect that makes it a VERY bad idea to add a little bleach to each fill. Not only does it damage the system, but unless you add enough to make your water taste and smell like a laundry, it’s not enough to do any good. Even if it were, any “purifying” properties in chlorine evaporate within 24 hours, leaving behind only the corrosive properties. "
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post #14 of 28 Old 05-22-2014
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Re: Keeping fresh water from fouling

we did it for months and years...a capfull each tank no damage effect.

cant get any simpler

its keeping the system in use that saves you from doing all the massive cleaning and hose changes etc...

once water stagnates it will need to be cleaned...no matter what

we deal with it here in our houses as water is cutoff every afternoon for the rest of the day

in the morning we fill our cisterns, I add chlorine like I would to a pool every month or so...but since we use it it never gets funky smelling...

I have only done the system flush if you will once and that was because the water in the 1200 galon cistern was left unused for a very long time...

this isnt rocket science either you can also add a splash of vinegar every once in a while too if you want something "edible"

use the system frequently and be happy if you cant either drain the water and deal with the tanks funk from being left "dry" or keep them in use

like somebody else said its the hoses and connections that get funly first...so clean them first if yuo ever have the chance

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post #15 of 28 Old 05-22-2014
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Re: Keeping fresh water from fouling

btw the reason we used chlorine on the boat(the captain was a doctor) was not to keep tanks from smelling or getting funky...it was to kill those organisms you might find in water around the world...

most of them can be killed off with simple dosages of bleach...we laso had a filtering system if we wanted to drink from the tank water.

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post #16 of 28 Old 05-22-2014
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Re: Keeping fresh water from fouling

If your tanks are getting fouled, have you tried antifouling paint? Should work pretty well since you're dealing with fresh water.
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Re: Keeping fresh water from fouling

the point of freshwater tanks is to have drinkable water even though its not always used for that...

all antifouling paints leach...even if its the new non toxic ones...

there are paints to paint the insides of tanks but they often dont last and peel away

id take an aluminum or monel tank any day over say a glass tank with paint on it...

antifouling is a baaaaaaaaaaaaaaaaaaaaaaaaaaaaad idea

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post #18 of 28 Old 05-22-2014
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Re: Keeping fresh water from fouling

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If your tanks are getting fouled, have you tried antifouling paint? Should work pretty well since you're dealing with fresh water.
must be a joke that didn't post well

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post #19 of 28 Old 05-22-2014
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Re: Keeping fresh water from fouling

Non-toxic antifouling? Sounds like an oxymoron thought up by Madison Avenue. Potable water grows things. Would we want it otherwise? We empty our tanks each fall with compressed air, which blows them and all the piping dry, so nothing grows over the winter. A rinse with water from the marina faucet (chlorinated) and a refill(same stuff), and we're good for another season with no untoward tastes, odors, or issues. So far we've had the boat 15 years. Of course we use the water in the tanks, and keep adding more, so that it doesn't just sit all season and grow things. Once they start, growing things can keep stubbornly growing and be difficult to remove. (Would we want it otherwise?) As others above have suggested, hit your entire system with a heavy dose of biocides (Chlorine, etc., making sure they won't interact with your hoses, gaskets, or whatever), flush until you're happy with the taste, and try again.
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Re: Keeping fresh water from fouling

paul do you have a link to the paint you are talking about?

id just prefer to not have painted tanks...however my current ones ARE glass and might need a treatment jajaja

go figure

thanks

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