I can't think of what nutrients which you could test for or why the info would be needed. Now I hear some of the true hydro boyz/gurlz worrying about ppm. You not trying to measure that are you? If you are the lower the reading means less parts per million of dissolved solids. They give you one of the measuring devices free when you buy a water purifying pitcher at Wally World. Good dope growing water prob be about like sorta dirty drinking water. Dont use any Alaskan Fish Fertilizer. That junk nearly killed my babies. They hovering on the edge as we speak. They are having good days and bad days. That stuff must have paraquat in it or maybe Round Up. Same stuff that goes into Miracle Grow Pearlite.

bigwheel