Thu, let me say I'm sorry this isn't working for you. I havent looked around but I must say it honestly works great for me. Both ppms and ph stay within close range of each other. I just put another two MK's in buckets and hooked them together. I don't have to pull the damn plants out every day..... I really do work through the res and don't touch the plants at all unless there is problem which I love......they're just too big.

I wish I could see your systrm in action, something is telling me we are missing something basic but I can't think of what that would be.