thanx for the response, it doesn't 'eat roots',just an exageration. i applied RE last night, already looking better in the res. i've done 10+ runs in this res, i think i'll replace it for the next grow. everything will get a bleach solution scrubbing. thanx 4 link stinkster.any other ideas any one? if i use a 'zyme, won't the sm90 kill it? i love sm90 it prevents 'bot' and helps prevent insect infestations. if ican just add a lil RE to the nut solution, thats what i think i want. sorry so rambling, trying to write fast b4 work. thanx again, talk to y'all soon.:bigsmoke: