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Old 18-07-2007, 14:18   #31
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All air has bacteria and assorted floating stuff. It may have other things not counting the bird poop on your deck near urban areas too. It means that untreated rain water from any place will grow stuff. Around here we get extra stuff too - like the coal power plant 4 miles away. I scrub it off my boat weekly.

You can drink rain water just fine but it will start growing stuff in your tank and you don't want that. I would treat all rain water and any unchlorinated water with chlorine. In the darkness of the tank reasonablly pure water won't be a problem. It's more about keeping your water tanks clean as over time things can propagate and develop into a whole colony of things.
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Old 18-07-2007, 16:41   #32
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Exactly, thanks. And after a little rain, the air is cleaned again.
I would be concerned about rainwater in your area because of the organics which would be need to removed by a basic filter before going into the tank. It would make a nice culture medium over time. If there are no nutrients, almost nothing will grow in water. Other than microfiltration and distillation, this isn't going to happen, so your water will need to be treated (if left in the tank for any significant period of time). I don't think I would want to use a deck as a water catchment area, because of the risk of pathogenic contaminants from the foot traffic, unless you can essentially sterilize your deck. And you thought bird poop was bad.

"Add bleach to taste" doesn't cut it for me. Given the concern about chloramines, and taste, and the risk of over or under chlorinating the water in your tank, does anybody have experience or suggestions regarding ozone for water tank treatment? The theory sounds great.

Interestingly, using a watermaker, making small batches and using it every few days, you may not need to treat the water (at least not much) if your tank is clean.

To: Little Boat. Do you have a photo or diagram of your rain catchment that you could share? How big is the water tank?
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Old 18-07-2007, 17:31   #33
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Quote:
And after a little rain, the air is cleaned again.
Not really it's the same air as before. You can't wash air. Treating water is more for the tank as you do use up the water but the tank is there every day. It's what builds up in the tank you need to concern yourself with. A small shot of chlorine isn't a bad idea and at least keeps you level. A periodic shock treatment isn't a bad idea either. Water born disease is number one in the world. It transmits perfectly fine.
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