I am new to the forum but was a subscriber years ago when I first had my pool installed. Currently my issue is green water. I read the post about liquid chlorine. I was wondering about the filter pressure before I started this process. I backwash and rinse the filter but the pressure does not change, but maybe a few psi. I am wondering if possibly the filter medium, zeosand, could be caked and need to be replaced before I start the liquid chlorine treatment.

Just for grins, I found this site and was wondering if anyone has heard of this guy or is this a scam: www DOT greenpooltips DOT com

oh yeah, 16x32 vinyl IG. approx 27000gal.