@Ned Kelly wasn't sure if you already had a earful yet so I decided to chime in regarding bleach lol. Unless you're running bennies/organics/living soils, then bleach won't hurt your plants provided you keep the ppms low. I run bleach in pretty much every facet of my setups,cleaning, sterilizing, etc like @rubthe nub said 10:1 I think I float right around 100 ppm of bleach, not sure haven't took a meter to my bleach soln in a long time, I just eyeball it. imo its so much more important( in my setups at least) to have proper sterile protocol vs running around trying to fix issues, I usually strip and bleach everything once a month, with general daily/weekly scrubdowns, that's just my ocd. nearly gave myself a heart attack last run when I thought gnats were root aphids..