My tap water reads at 118ppm and im wondering if after nutrients are added and im going for 800ppm should i have 918ppm or just go to 800ppm on the meter? Also, do you think its still beneficial to let the water sit out for 24 hrs w/ the tap water only at 118ppm to get rid of the chlorine or w/ low ppm does that mean there isn't much chlorine in the water to effect the plants? Any help would be great. Thanks