So we've had our pool 6 years, vinyl, above ground, 24' round, 12000 gal. My husband has somehow kept it clear for years by floating Walmart 3" tablets, throwing in baking soda occasionally, and putting in a couple packs of Walmart shock every other week or so. Never tested anything. So startup this year I decide to start taking care of the pool. I take sample to pool store..its just been a mess all season. I have test strips and a 3 way kit, but fic level only goes to 10. I have a yellow algae problem. I did pool math best I could figure out yesterday. Stabilizer was way high, drained about a foot and replaced and added a gallon of liquid bleach. How can I tell if I'm keeping chlorine levels up high enough with this test strip? And how long? New to liquid bleach use. Help..I'm about ready to call a bulldozer.