1 Comment

  1. Atom izer on November 14, 2022 at 6:30 pm

    Its best to use distilled or RO to wash the ph probe before and during the calibration. The ph of the nutrient solution will take a while to stabilize so you should recheck the ph afetr an hour to see if it needs any further adjustment. For tomatoes i would aim for 5.8-5.9