Hi, I have just purchased a BlueLab EC Monitor for use in my Dripper system, I am a fairly experienced grower and don't have any nutrient probs with my plants, I am using Canna Flores and dilute 40Mls Part A and 40Mls Part B with one litre of water, My tank holds 160 Liters, so that works out at around 600Mls of each part to fill my tank, and I have never had any problems with this. However According to Canna this should give me a reading of around 1.5 - 2.0 EC (thier Website gives different strength mix to the bottle!) However the BlueLab Monitor gives me a reading of 6.9, which according to the Bluelab instructions should be times by 500 to give the PPM, which in this case = 3450 which is extremely High! So my question is, should I take a background reading of the fresh water (no nutes) and subtract this from my nutrient reading? or does my tank need a good clean out?

By the way I am in week 4 of 12/12 and all 22 Plants are budding nicely, and the foliage is not showing any signs of nute difficiency or over fertilization.
FatBud Reviewed by FatBud on . EC PPM Hi, I have just purchased a BlueLab EC Monitor for use in my Dripper system, I am a fairly experienced grower and don't have any nutrient probs with my plants, I am using Canna Flores and dilute 40Mls Part A and 40Mls Part B with one litre of water, My tank holds 160 Liters, so that works out at around 600Mls of each part to fill my tank, and I have never had any problems with this. However According to Canna this should give me a reading of around 1.5 - 2.0 EC (thier Website gives different Rating: 5