BeefSupreme
Active Member
Total Disolved Solids, its normally used for pools to check chlorine levels and other stuff too. You can then test your ppm before you water and get it perfect every time. then test the run off to make sure the ppm is right. my plants need nutes and water waaaaaay more cause they arent stressed outwhat does the "tds" stand for? so i know what i'm asking for if they dont at the hydro shop....