We hold found red worms surrounded by our precipitation sea reservoir. how do we find rid of them?
Answers: I have a 300 gallon river trough for cattle. I add Clorox to the cistern periodically to keep mosquitos from hatch. A surprisingly small amount of Clorox keeps the marine in the reservoir clean and critter free. Following is one correlation for treating drinking water next to Clorox, but if you are concerned about it you could consult to your local health department for a recommended amount to affix to your tank.
http://www.i4at.org/surv/bleach.htm
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