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Old 20-06-2020, 17:34   #16
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Re: Getting odor out of fresh water system

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Originally Posted by a64pilot View Post
Calcium Hypochlorate (Bleach) will not kill a sessile bacteria colony, it will kill any in the water though, but isn’t effective on the slime layer on the inside of your lines and in your tank, .
That is 100% not correct! Bleach will for the most part kill anything with the correct dosage, and it is much much much les a dosage than what boaters generally add to a tank to “clean” it.
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Old 20-06-2020, 18:17   #17
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Re: Getting odor out of fresh water system

Since we drink the water from our tanks we prefer to limit the amount of bleach.

Perhaps a "shock" treatment to kill every thing might be OK.

We use the following formula to regularly treat water which is suspect. Sorry iof it is hard to figure out. Note it is for set sizes of tanks.

Note: Do not use water which contains bleach to pickle your watermaker, it is destructive to the membrane.
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File Type: xls Bleach use for water purification.xls (39.0 KB, 32 views)
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Old 20-06-2020, 19:14   #18
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Re: Getting odor out of fresh water system

1. “Shock” the tank with a high dose of bleach. 1/4 cup regular bleach per 15 gallons tank. Fill to top. Turn on all faucets to get bleach in plumbing. Let sit for two hours. Drain and flush several times. It will take about 4 flushes to get all the bleach smell out.

2. Check fill and vent hoses. Very common for stuff to grow in a dip in the hose. Clean screen at inlet to water pump.

3. City water has 1ppm chlorine This will keep a clean tank clean.

4. At least once a month completely empty and refill with fresh city water.

5. If using Watermakers water, add bleach to get to 1ppm (part per million) chlorine, Buy pool test strips to measure. You will only need to add about a teaspoon of bleach. In a vented tank like on a boat all chlorine is gone in about 48 hours. If you’ve gone a long time without new city water, add a bit of bleach to get back to 1ppm

6 Always use your own hose to fill the tank. Empty it before storing away. Put a filter on it.

7. Put a drinking water spigot on the galley sink. There are better choices now than Seagull for much less money. I use a Pentex Flo-plus 10 that meets the newest ANSI 53 standard. Costs $15.

8. A bottle of bleach in a locker has lost most of it’s strength in six months. Instead of liquid bleach try a powder known as Sodium Dichlor. Get a 1lb container for $10 at a store selling hot tub chemicals.

If you do all of the above, your water will taste better than bottled water. I no longer have plastic water bottles on the boat - which saves a lot of money and my back from lugging it aboard.
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Old 20-06-2020, 20:13   #19
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Re: Getting odor out of fresh water system

What kind of odour?

I use filters on my water for cooking and drinking purposes, and for all else there is chlorine. I put some Milton solution into the water tanks--just enough that one can notice there is chlorine in the water. The chlorine kills any bugs, and the charcoal and biological filters remove the chlorine and anything else in there.

If I fill the tanks with a town water supply I leave the chlorine out--but if I fill them from any stream, I add the chlorine. One has no idea what bids or other critters have polluted that crystal-clear stream water.
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Old 22-06-2020, 03:10   #20
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Re: Getting odor out of fresh water system

I put 4 1.5 liter bottles of cheap cola into the tank ,fill with water and run it until it comes through the taps ,leave it overnight, run the taps dry the next day ,flush with a couple of water fills
It stops any odours
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Old 18-07-2020, 08:08   #21
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Re: Getting odor out of fresh water system

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Definitely follow Peggy municipalities use Cl for this very reason & regularly “shock” end Consumer lines with higher concentrations Of Cl compounds to keep the water potable. (Which is why u will smell Cl more strongly at the tsp from time to time).
Utilities will blow off a line at the end of a road if it doesn’t see enough turnover, but they have no way to shock the line (nor would they want to) unless the line has been depressurized (main line leak repair). It’s a big hassle when fixing a leak, and even bigger hassle to shock a line that has been in service.
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Old 18-07-2020, 08:13   #22
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Re: Getting odor out of fresh water system

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try dropping a zinc anode in it. work in hot water tanks with well water

This is only going to work in metal tanks, and only if the zinc is anodic to the metal (not aluminum, for example). Water heaters can get smelly because of reduction of sulfate to sulfide by galvanic current, which is unrelated to the topic.
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Old 18-07-2020, 09:26   #23
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Re: Getting odor out of fresh water system

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Utilities will blow off a line at the end of a road if it doesn’t see enough turnover, but they have no way to shock the line (nor would they want to) unless the line has been depressurized (main line leak repair). It’s a big hassle when fixing a leak, and even bigger hassle to shock a line that has been in service.
Interesting additional information-our local water utility does increase the concentration a few times per year - we were told it was to ensure the lines met end user spec. I would still recommend Peggy Hall’s guidelines since they seem effective & safe to those who follow them - with much smaller quantities of bleach than some are using/recommending
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Old 18-07-2020, 09:29   #24
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Re: Getting odor out of fresh water system

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Interesting additional information-our local water utility does increase the concentration a few times per year - we were told it was to ensure the lines met end user spec. I would still recommend Peggy Hall’s guidelines since they seem effective & safe to those who follow them - with much smaller quantities of bleach than some are using/recommending
If they do this, it is done at the treatment plant or chlorination booster stations in the system. Also, if they are boosting to meet spec during monthly testing, that’s a no-no.
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Old 18-07-2020, 09:35   #25
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Re: Getting odor out of fresh water system

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Originally Posted by Flatswing View Post
...I would still recommend Peggy Hall’s guidelines since they seem effective & safe to those who follow them - with much smaller quantities of bleach than some are using/recommending



BTW, these are ANSI standards, not just something one person thought up, so they have been well-vetted.
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