If you replaced the complete grids, INCLUDING membranes, then this 'STICKY' may not be immediately applicable:
http://www.poolforum.com/pf2/showthr...ng-a-DE-filter
But, if you did NOT replace the membranes, it is. And, you should read it anyhow, since improper cleaning seems to be a common cause of DE filter pressure problems. OTHERWISE:
1. Make sure your gauge is OK -- it should read 0 with pump off. If not, replace it.
2. If you have in-floor cleaning returns, bypass them or open them fully.
3. Tell us what returns (and valves, and gear) you DO have down stream of the DE filter.
4. OPTIONALLY: you can cut in a Tee, with a valve on the side outlet, and then use that Tee (with the valve open) to test whether the restriction is internal to the filter and near piping, or if it's further downstream.
Bookmarks