Hayward Slide Valve Assembly for ProGrid DE Filters | SP0410X502S Lubricants Every 2 Weeks: Add 1/2

Every 2 Weeks: Add 1/2 lb per 10

The safety buoy must be removed from your pool when swimming

Following dosage chart below

Hardness and Cyanuric Acid

Hayward Slide Valve Assembly for ProGrid DE Filters | SP0410X502S Lubricants Every 2 Weeks: Add 1/2The Hayward Slide Valve Assembly (SP0410X502S) is the OEM replacement 2" slide valve assembly for Hayward ProGrid DE Filters. What It Does This slide valve assembly controls access to the filter's internal grid assembly and manages air release during startup and priming. The one piece clamp design allows quick, tamper proof access to internal filter components without disturbing existing plumbing connections, while the built in manual air relief valve