Short life on DE filter grids?

txnhockey

New member
May 23, 2022
1
Houston, TX
Pool Size
20000
Surface
Plaster
Chlorine
Liquid Chlorine
Hi all, newish pool owner, purchased with the house at the end of last year.

Just completed my 2nd deep clean of the Pentair FNS Plus 48 DE Filter, but this time I pulled the grids out. I noticed many of them had hardly any thread left on the bottom of the grid plates. Many of them the seams were able to be easily separated. We were fighting sunlight and I figured they would be better than nothing. Sure enough the Polaris has sucked up a significant amount of DE (~1lb) in the 3 cleanings since then.

I'm a bit concerned because a lot of data points talk about 7 or even 10 year old grid plates. These are less than 4! Does that seem normal? Or is there something I or the previous owner did to contribute to a short life span?

P/N: 180008
FLT FNS PLS 48
Date: 12/19/2018

Clean pressure: 11.5 PSIG
I have never seen it circulate higher than ~16 PSIG except on pump starts.
I searched the forum and saw some concerns about the multiport being plumed backwards. However it seems to be aligned correctly and furthermore no traces of DE on the inside of the grids when cleaning.


Also a question on replacement: I noticed the full set of grids sold on amazon ~400 have a tube looking thing with a filter on the end. Mine only has a molded breathing port/grid in the top plastic manifold. Is it worth it to spring for the full set or just go with the generic filter grids only. I don't mind the labor to replace.

Thanks
 
You likely have a CMP replacement manifold. You'll never lose the air-relief screen. Most replacement grids are aftermarket, i.e. Unicel, Filbur, Pleatco. Those are the brands that have the best reputation.
 
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