I am fairly new to hydroponics and for my first garden/hydroponics project ever I made a flood and drain system, plans from http://living-learning.com/faq/homebflo.htm. Each pot is a cleaned butter container, with holes drilled at the bottom and inside each butter container is a bunch of L.E.C.A (clay aggregate). After starting my tomato seeds in a different system (where the seeds were in rockwool cubes), I moved the cubes to the butter containers. Before this I checked the Ph. It was pretty high so I used my Ph down a lot. After about 50 drops of Ph down, I decided that I might as well try transplanting. So I moved half of the tomato sprouts to the butter containers. Now I realized that my water was a little murky from the LECA and so I checked the Ph. It was over 7.4. I put like 100 drops of Ph down, but I could only get it to like 7.1. It went back to 7.3 half an hour later. So I'm wondering what I should do, and if the LECA has high Ph. If it does, I should probably soak it then toss the water then soak/toss, then put in hydro system. I sound like a newb, but that's because I am one. Please help.