My 4000 series Pentair DE filter is leaking water from the backwash pipe. I wanted to know, weather or not will adversely affect my return clean water if I just close the filter's backwash exit? instead of leaving my discharged pipe open which is my currently set up. I have changed both o-rings on the rotor. Also changed the white in color rotor seal.
I am so very frustrated because I have replaced all all of the seals to prevent any leaks, but I am still dealing with this problem.