I've had my pool for about a year and a half. Haven't had much of a problem with keeping the pool clear. I decided recently to raise my CYA level. I need to get a good test kit. I only have a 4 way and some test strips. The test strips said my stabilizer was low. So I added some CYA. I've been having trouble with algea ever since. Just before I went on vacation ( and about a week after I added the CYA) the pool started turning green. I dumped in 3 gals of 6% bleach in an 18,000 gal pool. The chlorine level on the 4 way test was dark yellow, almost orange/brown. I come back and the pool is green like a pond. No chlorine showed up on the test. I added 3 gals of bleach. 2 days later the pool just as green. Tested a couple times a day. Always very high. Tester goes to 3 ppm. My levels much higher. I added 3 more gals of bleach to kill it off. 3 days later it's getting a little better, but not as fast as I thought.

I've seen a chart here showing stabilizer levels and required chlorine levels. I'm wondering if my chlorine levels are high enough, even though my tester shows off the chart?