Filter Pressure question

[duraleigh]

Something from your water is plugging up your filter......algae is my first thought. Test numbers posted might give another clue.

[donkipp]

Something from your water is plugging up your filter......algae is my first thought. Test numbers posted might give another clue.

Thanks I will post my latest readings when I get home.. Does the algae have to be visible??

I did have a low chlorine problem 2 weeks ago, but never saw algae..