Inherited a 27' round 52" deep, AG vinyl pool that was uncovered and untouched for 2 years. As of now, dark black, green water with much debris. Have TF-100 test kit and tested CYA and pH prior to starting SLAM method. Adjusted ph to 7.5 and it looked like 0 CYA so I added a gallon of liquid stabilizer. Now looks like maybe 20-30 CYA? I have not checked other levels since it was not mentioned in SLAM method and I'm not sure how accurate they will be since the water is so dark and murky? I have a Hayward xStream AG cartridge150 sq ft filter and 1.5 HP pump. Since starting yesterday, I have had to change the cartridge 3 times already and am wondering if I'm on the right path?? Any advice for fastest clean up, since this pool is beyond green?