I'd be concerned about leaving even a moderately strong chlorine solution in the system for even a few days. Chlorine is extremely corrosive to many metals - even stainless steel. Better, I think, to hit it with a dash of bleach, pump some through the piping, and drain it. Also, chlorine bleach is not, in itself, an effective cleaner. Indeed, it's disinfecting action is blocked by accumulations of organic matter, such as algae. As an alternative (though I haven't tried it), one might use one of the commercial iodine based cleaner/disinfectants known as iodophors that are used in the restaurant/bar trade for cleaning glasses. Iodine is very similar to chlorine in its sanitizing properties, but has the advantage of being non-corrosive. It also does not dissipate into the atmosphere like chlorine, retaining its effectiveness longer. I'll try to check it out further - I know a company that manufactures these kind of products for the food and brewing industry - and try to get a better read on it.
-------------------------------------------- Wes Neuenschwander Seattle, WA (wesn@eskimo.com)
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