to be fair, ive heard of people using bleach succesfully in hydro to get rid of jelly on the roots and other such problems but what youve just said does make a lot of sense. i use sm-90 wich amongst other things is a pre-emptive pesticide that should put anything that can manage to make it to my roots want to leave once they get there. also contains good bacteria that help kill funghi n stuff and helps your plants absorb nutrients. seems to do the job for me but im investing a lot of money in one of my mates just now and he got completely wiped out by whitefly last time he tried it himself. so im on a mission to find some chemical users to see how the plants actually react. my book tells me its safe but my pest control bible obviously doesnt have a sub section for weed growers lol. most folk are just put off by the scare stories so spend months fighting with oils and soapy water without ever trying pesticides to see what the effects are. im not game for that like. way too much stress