Pentair Standard Body Return Fitting 542414 - Fiberglass 5.5 inch Chlorine reduction without sacrificing sanitation:

Chlorine reduction without sacrificing sanitation: Uses minerals in a cartridge to lower chlorine use by up to 50% while keeping the same sanitizing power

and when used with the XL Pro system

System:3 Sand Filter

Restores scrubbing power lost as brushes wear

Powerful shock treatment: quickly elevates chlorine after heavy use or rain events

Pentair Standard Body Return Fitting 542414 - Fiberglass 5.5 inch Chlorine reduction without sacrificing sanitation:Pentair Standard Body Return Fitting 542414 Return Fitting Features: Standard Body Return Fitting for Fiberglass Pool and Spas 1 1 2" Threaded X 1 1 2" Slip Socket Color: White Pentair 542414