What ingredient can be safely added to the barrel water to kill the bacteria, but not harm the plans when used.

Lloyd Beaman
by Lloyd Beaman
I have constructed 4 rain barrels along the side of my home with 3/4 inch fittings. I have found that the higher off the ground the better water pressure, but even though I strain the water before going into the barrel, still particles and mosquitos get in to contaminate the water.
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