Hi Alex, sorry for the delay in getting back to you, you may remember you sent me two different 20" filters to try out. I have been using the blue one for the last 8 weeks and was able to run at 80 psi through the booster pump. I have today changed over to the Pentek FloPlus 20 and at the moment it is running smoothly at 100 psi, I will monitor this over the next week or so but at the moment it seems to be better than the blue one. I did notice when I took the blue one out it was quite dirty, although the water iside the housing seemed clean enough.