Jaindohanswered grow question 6 years ago I have had similar experiences with Diatomaceous Earth. What I would do is pH a whole mess of water with pH up/down -- don't let anyone tell you you don't need to at least have that stuff around because you're in soil. But pH it below the 6.3-6.8 soil range first. I would run like 5 whole gallons at 5.6-5.8, wait, test runoff, and then probably start flushing with 6.3 water similarly once they've dried out.