Hello. I need a little info about my runoff. My girls are on day 30 of flowering. I fed them last night and took my first reading since they were flushed a few weeks ago. I fed them the solution at 1050 PPM and a pH of 6.1. The run off of the pH on 2 plants were 6.1, and on 1 plant, it was 6.0. The PPM's run off ranged from 630-700 PPMs. can anyone explain the runoff PPM's being lower. Is that fine. Any knowledge would be appreciated.