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 > % bleach to sanitize fresh water tanks

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bob213

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Posted: 05/31/20 06:58pm Link  |  Quote  |  Print  |  Notify Moderator

I pour the bleach into my fresh water hose at the hose bib end. Hook it up and fill my FW tank. Hose is sanitized and so is tank. I've always gone with 1/4 cup to 15 gal.


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Dutch_12078

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Posted: 05/31/20 07:08pm Link  |  Quote  |  Print  |  Notify Moderator

The Northeastern info sheet seems to be for surface and bio-hazard decontamination where extended "soak time" is not very practical. For RV use, letting the weaker concentration sit for 3-4 hours is not usually an issue and cuts down on the difficulty of rinsing the taste out of the plumbing system.


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cavie

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Posted: 05/31/20 07:35pm Link  |  Quote  |  Print  |  Notify Moderator

1/4 to 15. Nothing else!!!!


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SAR Tracker

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Posted: 05/31/20 08:36pm Link  |  Quote  |  Print  |  Notify Moderator

Boon Docker wrote:

RoyF wrote:

After draining the bleach, I suggest adding a cup or two distilled vinegar when you refill the tank. Drain again and refill with water only.


What is the reason for the vinegar mixture?


Removes the bleach taste


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rvshrinker

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Posted: 05/31/20 09:05pm Link  |  Quote  |  Print  |  Notify Moderator

great, i liked the bleach in the hose idea and went with it. will rinse out tomorrow.

docsouce

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Posted: 06/01/20 07:05am Link  |  Quote  |  Print  |  Notify Moderator

Related Question. Do you guys drain and isolate your hot water tank or sanitize that too..


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Lynnmor

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Posted: 06/01/20 07:25am Link  |  Quote  |  Print  |  Notify Moderator

docsouce wrote:

Related Question. Do you guys drain and isolate your hot water tank or sanitize that too..


Of course, do the water heater as well. The hot and cold water comes out the same hole (faucet), so do it all.





mbopp

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Posted: 06/01/20 07:43am Link  |  Quote  |  Print  |  Notify Moderator

And remember - you must use real bleach, not the splashless type. Different chemical makeup.


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Matt_Colie

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Posted: 06/01/20 07:52am Link  |  Quote  |  Print  |  Notify Moderator

Doesn't anybody else use hydrogen peroxide?

We have for decades. Not the low density stuff for cuts, but the big number for hot tubs and such. Water tastes better when it is done.

Matt


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JimK-NY

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Posted: 06/01/20 03:46pm Link  |  Quote  |  Print  |  Notify Moderator

Years ago I got tired of all the advice and personal opinions. I did a literature search and found actual scientific studies and recommendations. Sorry I did not save the webpage and could not find it. I am positive of the results.

The recommended bleach concentration is 1/4 cup of standard household bleach for every 15 gallons. Standard household bleach is in the range of 5-6%. The recommended soak time was 1 hour, not 4 hours, no 12 hours, not overnight, but 1 hour.

There is probably little or no harm to soaking for a couple of hours or so but it is best to avoid prolonged soaking and especially avoid high bleach concentrations. Bleach is not friendly with pump seals, etc.

I could not find any solid, scientifically based recommendation for the frequency of disinfecting RV tanks. It seems that a tank in regular use with typical municipal water containing bleach will be good indefinitely. If you use something like unchlorinated well water you might want to disinfect at least every couple of months, but that is strictly a personal opinion. I have found that my RV water starts to stink after a couple of months when not used.

Beyond any doubt, sanitize the water water system. Legionella can be a really nasty disease and there have been reports of Legionella growing in hot water RV tanks. Doing the hot water side is a pain in most RVs. I first remove the plug anddrain my HW tank, use a spout to clear out any sediment, then I put the plug back in, fill with water containing bleach, soak and hour, then remove the plug to drain, and finally reinstall the plug and fill with regular water.

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