How To Use A Spa Draining Pump- Pool And Spa TV Video. How To Use A Spa Draining Pump.

How to Backwash Hayward DE Filters For Swimming Pools. The purpose of backwashing is to blow out the old DE, with its trapped impurities, so you can replace it with clean DE. Below are the steps you should follow for both “Bump Style” and Multiport Style DE filters.