i have tried for 2 years to get rid of this stuff. not sure if it's dropping out of tree abovepool or algea. it is on top of the ladder not in the water also. but it is not slimey until it gets wet. i only have 5 in 1 test strips to test with and my ph is 7.2 cya is low alkalinity is 100 range chlor is low. i know i need a test kit but low on funds for now.. can u tell me what i am fighting.. also i vac everyday and my skimmer sock gets full of slime and turn a rust colored brown. i have a 2500 gph in tex cartridge pump with a hayward skimmer. i don't use intex brand filters i use pleatco pin 20. please help me......