Athosanswered grow question 5 years ago Hi there. First of all, according to your posts, you are growing in soil, so the pH should be between 6.0 and 7.0, not 5.8. Secondly, soil will buffer your pH, which is why our run off is higher. Third, soil runoff of 2200 PPM is quite low, rich soil mixes can have a run off as high as 10.000 PPM (I'm talking from experience); as the plant consumes the soil nutrients, the run off will drop weekly. If you flush the soil, you could end up with soil devoid of any nutrient for the plant to take in.