Minimum pool size - what?

Hey Rnacker and Welcome !!! The overwhelming majority of short filter cycles we see are chemistry issues and not mechanical ones.

Newb after newb after newb comes in wanting it to be the filter, which is actually doing a great job filtering out the nascent algae bloom kept at bay just under being visible. It amazing how long one can be right at the edge of a full blown swamp.

Get a good Test Kits Compared, then
Overnight Chlorine Loss Test. You'll likely fail the overnight test, which means you have algae if you lost FC once the UV from the sun is removed from the equation.

Then it's time to SLAM Process.
 
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