Please help. DE at the bottom of my pool.

cruzmisl

Well-known member
May 26, 2007
185
#1
Hi All,
I recently installed a Pentair FNS plus 48sqft filter and a 3/4HP Whisperflo pump. I get DE at the bottom of my pool though. I took the filter apart and inspected and cleaned the grids. All seemed OK so I weighed out 4.5lbs of DE and recharged the filter but still getting DE in the pool. It's a small amount though, it doesn't blow out of the retruns or anything like that and the pool water itself is clear. Any suggestions on how to clear this up? IS the filter on my Blue Diamond fine enough to trap the DE? I put it in and it picks it up abut then it returns later. I'm thinking the Diamond may stir it up but not actually trap the DE.

Thanks!
Joe
 

JasonLion

TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
37,879
Silver Spring, MD
#2
The Blue Diamond should be able to trap the DE. You should be able to see some of it in the collection bag.

DE in the pool usually means a problem with the grids, either holes, or installed improperly. Did you remember to use the rinse setting after backwashing (assuming your valve has a rinse setting)?
 

cruzmisl

Well-known member
May 26, 2007
185
#3
I did use the rinse after backwashing and the grids looked fine ot me. It's a brand new filter. Maybe I should call Pentair......