Salt buildup from your nutes will cause your soil pH to drop. To fix this problem you should flush your plants with double the amount of water as there is soil, so if your in a 2 gallon pot your going to flush your plant with 4 gallons of water. The 4 gallons of pH adjusted water will remove alot of that salt in your soil, then you can test your soil run off again. You should be around the correct range, if not, keep flushing until you reach that magic number. IF you do not flush your plant, you will end up in a lockout and if left unattended could take you over a month to get out of.

Hope that helps.
whatsthatsmell Reviewed by whatsthatsmell on . Why has my Ph droped? I grow in soil, righ now i am in 2 gal. pots. I have 6 plants that are about 25-26 days through veg. I have been using only growbig mixed with rested tap water. I started at 1tsp/gal after 1 week of veg have worked my way up to 2 tsp/gal. My plants look healthy and all, but today when i watered and tested runoff Ph almost all of my 6 plants tested at around a PH of 5.... Why is my Ph droping?? I was thinking possible salt build up, I heard that FoxFarm products tend to create alot of Rating: 5