You need to get your cl to shock level and keep it there until the cl holds overnight. You can dilute the pool water more to test higher levels (4 shots distilled water to 1 shot pool water, multiply test result by 4, for example). Look at the best guess chart, you need to get your cl level to at least 15ppm and keep it there. If you can, test 3 times a day and add bleach each time bring it back up to 15ppm. Run the filter 24/7, brush daily and be patient....you'll have a clear pool soon. It is crucial that you keep the cl up to shock level, the more it yo-yos up and down, the longer it will take.

I have a 24 ft AG (52") and 1 gal of ultra (6%) bleach adds a little more than 4 ppm to my pool.

Good luck!