Filter Cartridge Replacement Interval


Well-known member
Aug 29, 2016
Rose Hill, KS
The pool store (dirty word) recommend replacing the filter every year. That was recommended to me when I didn't know about the TFP method and spent $ with them.

Is there a recommended interval to replace the filter?

I've had mine installed for about 12 months and it looks good. I typically clean the filter every other month when the temps are cool and every other week when the pool is in use.


Mod Squad
TFP Expert
Platinum Supporter
LifeTime Supporter
In The Industry
Apr 1, 2007
Sebring, Florida
If they look good, how does your flow compare now to when they were the psi near the same?


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

You don't need to replace them unless they stop working..

Does your pressure go up by 25% each month, or do you just like to clean them that often?

Unless the pressure increases by 25% over the clean pressure, there is not real reason to clean them.

Thanks for posting,

Jim R.


Gold Supporter
Jul 17, 2016

I just replaced my filter cartridge this last weekend. My pressure never changed by much so I waited a year before changing it. When I pulled it out, it was very nasty. Since they run about $80 for mine (i.e., $6.66 /month), I decided to just throw it out instead of washing it clean. That way I am guaranteed the best filtering possible each swim season for the price of a nice meal out.


LifeTime Supporter
Sep 6, 2013
Nashville, TN
I'm on year 3 with the same filter cartridges, just spray them clean every few months depending on the weather. I noticed the last time around there are some cracks forming around the rubber ends so if those get larger it might be time to replace.


Well-known member
Aug 29, 2016
Rose Hill, KS
The filter still looks new and my pressure is about the same when it was new.
I clean the filter on a monthly basis just to keep it clean. The highest pressure rise I've seen was 10% before cleaning.

Today I started the hair net in the skimmer which method which will reduce my cleaning intervals if I go by the 25% rule.

Thanks for the replays. This is another example of how the pool store says the filter should be replaced every year to get your $.


TFP Expert
LifeTime Supporter
May 3, 2007
Pleasanton, CA
My last set was 10 years old when I replaced. The media was fine but the end caps were no longer holding the filter in the manifold. Take care of them and they will last a good long time.

Iceman 21

Well-known member
Jan 31, 2017
Sacramento, Ca
I replace my cartridges ever other year and use use a skimmer socks. Im sure some will argue that this is overkill but i can find my cartridges online for about $150. You can never have your water too clean.