I was at my local hydro store yesterday and was checking out a setup of a 4 bucket undercurrent system. I thought it looked pretty good, but the guy who worked there told me that he wasn't really impressed. He said he's having alot of trouble with the pump clogging up which causes very low pressure running through the system. The solution going back to the res bucket was barely flowing. He said he's had this problem with both organic and regular nutes. I thought this was strange, since all the systems online, including your, seem to be working fine. Maybe this is just a problem with the smaller 4 bucket system with a smaller return line? But thats just a guess. Oh well, I grabbed a few things that I needed, although I had to leave before I emptied my wallet. I allways feel like a kid in a candy store in there. Lol, I could do some serious damage to my finances (especially if my girl wasn't in the car waiting)