With a cartridge filter you can't. Carts can filter down to 20 microns which is pretty small. you can't filter out live algae....you need to kill it.Originally Posted by itstoohot
Re: Could this be algae or dirt/pollen?
With a cartridge filter you can't. Carts can filter down to 20 microns which is pretty small. you can't filter out live algae....you need to kill it.
Retired pool store and commercial pool maintenance guy.
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