Ive read about compost tea too, never tried that but i did try milk, which didnt really work. How do you make lactic acid? Mind sharing your procedure?
It might work in the tent But where did the spores come from thats the real problem? If the pm is not to bad we dont have pics so we dont know It can be held off with some simple cheap sprays.
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i would certainly consider burning some sulfur in the basement between grows or while in veg. The vapors can get into all cracks and crevices. The only way I see you getting this controlled is with a multi prong approach. Filtration, eliminating sources, temperature and humidity control. Using some biological sprays like cease Or the like in the basement and in the tent as well as the plants will help a bunch. If you could try to seal up the basement tight that would help to keep out any outside air and spores from getting in.