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 bleach for water purification
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Walt Oler
1st Mate

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USA
44 Posts

Initially Posted - 02/04/2009 :  20:27:37  Show Profile  Visit Walt Oler's Homepage
The first job when we got our new (to us) C25 was to remove, clean and sterilize the water tank, replace hoses to the sinks, and overhaul the sink pumps. Knowing that it was all clean to begin, we filled the water tank and added a little bleach for sterilization. The first 17 gallons tasted fine but I didn't pay attention to how much bleach I used. The 3 oz of bleach that I put into the second tank-full was too much and gave a bad taste. Anyone have recommendations on the amount of bleach required to keep the water safe?

Edited by - Walt Oler on 02/04/2009 20:28:19

delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts

Response Posted - 02/04/2009 :  20:37:50  Show Profile  Visit delliottg's Homepage
Walt,
Here is the [url="http://www.epa.gov/OGWDW/faq/emerg.html"]US Government recommendations for using bleach[/url] to purify water. Remember to make sure you know what strength the bleach is your that you're using when you do your calculations.

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Walt Oler
1st Mate

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44 Posts

Response Posted - 02/04/2009 :  20:55:10  Show Profile  Visit Walt Oler's Homepage
From your reference,
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote">Add 1/8 teaspoon (or 8 drops) of regular, unscented, liquid household bleach for each gallon of water<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">

So, we need a little over 2 teaspoons for 17 gallons. I guess we exceeded that by a factor of about 100. No wonder it tasted so bad. Thanks, David.

Edited by - Walt Oler on 02/04/2009 20:56:24
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts

Response Posted - 02/04/2009 :  21:02:05  Show Profile  Visit delliottg's Homepage
Don't feel bad, I did roughly the same thing, I think it was 2 ounces into our 13 gallon tank. It was pretty rough till we could dilute it. However, we always carry spare water anyway. I miscalculated by roughly the same factor.

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redviking
Master Marine Consultant

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USA
1771 Posts

Response Posted - 02/04/2009 :  21:12:27  Show Profile
As full time cruisers we routinely add one capful of bleach to each of our 35 gallon tanks to prevent growth. Leave the fill cap off for an hour or so and your water will be fine. A carbon/charcoal filter will remove some of the bad taste, but water from your tanks should always be treated as suspect and either filtered or boiled. We cook, clean, etc and have never gotten sick from our water supply - but we aren't drinking a lot of it either. Too much bleach will make you sick.

When we return to SV Lysistrata - about time - we will pump our tanks empty, add several ounces to each tank and fill. Pump and fill about 2-3 times until the water tastes good. Then we will use the capful method and use our water supply as normal. Remember to run the water for awhile before filling as water in the lines and in the hose will impart a bad taste.

Sten

DPO Zephyr - '82 C25, FK, SR
SV Lysistrata - C&C 39 - going "home" in a couple of weeks! Hope I remember how to sail!

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Voyager
Master Marine Consultant

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5430 Posts

Response Posted - 02/04/2009 :  22:19:17  Show Profile
I use the tank for water for dish washing & rinsing and hand washing. 1 Tsp of bleach seemed to be fine for this purpose.

I also have about 10 1/2 gallon polycarbonate bottles that I use for drinking water.

Since I don't use the portapotty, I put a wooden carton in the head area to hold the bottles, to keep them from rolling around.

For two people, this works out fine for a 3 day trip. I never have to worry about running out since you can get pretty good water just about anywhere in CT.

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britinusa
Web Editor

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USA
5404 Posts

Response Posted - 02/04/2009 :  22:40:04  Show Profile  Visit britinusa's Homepage
Ok Bruce, if you don't use the porta potti, on a 3 day trip, then .... what?

(Or do you reuse the 1/2 gallong bottles )

Paul

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islander
Master Marine Consultant

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USA
4029 Posts

Response Posted - 02/05/2009 :  16:47:47  Show Profile
Now THATS funny!!!

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