Backwash Frequency


Bronze Supporter
Nov 30, 2019
Pawleys Island, SC
I've been told to watch for a pressure increase to know when my sand filter needs to be back flushed but my system pressure has never increased in the 2 months my pool has been up and running. The pool has never been very dirty, I keep up with it pretty religiously. I use a skimmer sock and also have a leaf collector on my vac hose. Given that my filter has not gotten dirty enough to show a PSI increase, should I be back flushing anyway, and on what schedule?


Mod Squad
TFP Expert
LifeTime Supporter
Jul 7, 2014
Bedford, TX

There is no need to backwash if the dirty pressure does not go up by 25% over your clean pressure.. Just for general purposes, I would backwash at least once a year no matter what the pressure was.. Skimmer socks or hairnets are a big reason for your success.

Thanks for posting,

Jim R.