I'm losing the battle with algae this spring. I've followed the forums advice and have had my chlorine levels high for days, but algae lives on. My water parameters are:

Total Hardness 100 ppm
TC 10 ppm (that's as high as my test kit goes)
FC 10 ppm (see above)
PH 7.8
Alkalinity 90ppm
CYA 50 ppm

I'm wondering if my filtration system is adequate......I have an 18000 gallon pool powered by a Pentair Supeflo 1.5 HP being filtered by a hayward Star Clear c1200. I seem to be cleaning my filter cartridge every third hour and my garden hose no longer cleans it, I had to purchase a pressure washer to get my filter's PSI back to where it ran last year.