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Odd, my grandmother has been using rain barrels for years, and never noticed a smell except for when a squirrel fell in, drowned, and was not discovered until later. (PU)
What was the barrels used for before converting into rain barrels? My Grandmother only uses spent food grade plastic barrels.
If cleaning the barrels are not an option, then poor some bleach in. This is two fold. One to kill the green matter, and the other is to kill the misqito larva. Syhe has never noticed any nasty effects on her plants. (Roses, Hardwood honey suckle, azaleas, Japaneses Red Maple, and vegetable garden)
If the top of your Mom's house is in the shade, and has shingles, she could have an algae infestation that could be causing the problem. (According to my Grandmother.)
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