Hayward CAT 4000 Standard Package with Wi-Fi Transceiver | W3CAT4000WIFI Pentair Complete Levelers The in-line filter assembly is

The in-line filter assembly is a replacement part made by Polaris

secured by an o-ring

reducing installation time and potential error

Always turn off pump power and relieve system pressure before servicing

Hayward CAT 4000 Standard Package with Wi-Fi Transceiver | W3CAT4000WIFI Pentair Complete Levelers The in-line filter assembly isThe CAT 4000 revolutionizes how water quality can be monitored and maintained. A pool operator typically checks, records, and adjusts pool or spa water chemistry hourly at best. The CAT 4000 continuously samples pH and sanitizer activity, adjusting the feeding of chemicals on a basis proportional to the demand.