Doing its job. Sand lasts for billions of years...if you didn't put gunk in it.My sand filter did a great job getting it from swamp green to this…does that mean the sand filter is effective or does it need to be looked at. Sand was replaced 4 years ago (not used last year bc our liner when out).
Yes I am using pool mathAre you using pool math? Share your logs. home page--gear upper right--scroll to bottom and enable tfp sharing.
Can you test and replace more often?