Hello,Does filter cartridges NEED constant psi to clean?We have a cistern that fills from a well first (no-psi) until well pump kicks-on, Then into bladder tank,I have a 20 big blue 5micron culligan sediment and mainly want to reduce maganses that is growing@ the bottom,Our softern is after this tank.Any help out there?Thanks and keep on truckkin!!!! IS THIS a FORUM????????? OR NOT??? need some help please!!