Backwash leak/de grids

Debigold

Active member
Jul 1, 2018
28
San Juan Capistrano, CA
Good morning. We have had a mystery of de not sticking to some of the grids by where the backwash exits the filter.Replaced with new grids still the same problem. The other day I noticed a small leak in the hayward slide push/pull backwash valve. Ordered piston o rings. Could this be the reason de not sticking?