Last night I checked my tent grow and the ppm was the same or slightly higher? The ph was around 6+ so I took out a gallon and added plain phd water, checked after work today and thw water went down a gallon but the ppm stayed the same ?! So I just added another plain phd gallon with a touch of hygrozine .What do you think is wrong ? Is this normal ? I'm in the 3 rd wk of flowering using AN sensi grow and bloom trying to keep ppm below 1000....Any ideas ? Thanks Spike ...