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What would be a non corosive, non toxic, won't evaporate, and inexpensive alternative to salt for detering mosquitos, algae, etc in water?

Question asked by John Boyd on Jul 22, 2014

The application would be for a water in an outdoor water proofing sealed cement holding area. I also have a sub-question as to any suggested cement sealant which would be a good match for the water additive.