New to the forum and in need of advice. I'm replacing a Pentair FNSP-48 DE filter with a Pentair TR100HD sand filer. The inlet and out on the filters are reversed. The multi port valve has the same mounting specs and fits perfect. I am reusing the valve. Would it be better to run in the backwash position and backwash in the run position? Or make the valve outlet the new inlet and vise versa since I have to cut and reposition due to the size difference?
New filter installation help
- Thread starter BBCAT
- Start date
Why are you swapping to sand? Sorry I can't help and not trying to waste your time, but DE filters are considered a premium filter material. Grids can be replaced with a significant savings over replacing the whole filter.
The bottom half has a crack that I have been nursing along for a year and is getting worse. The grids needs replacing, got tired of messing with the DE and I wanted to try something new.
I did not think you could swap the valves between the DE and sand filters ... even if you did come up with a conversion of the settings. 
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