Cloudy blue green pool

A CC of zero is not indicative of no algae. CC is primarily created by the oxidation of ammonia based compounds by chlorine. Algae typically produces little to no CC when oxidized. Also, CC rapidly burns off when UV hits the surface of the pool.

You need to follow the SLAM Process. Lower your pH to 7.2 and raise your FC to 28 ppm and maintain that until the pool is clear and you pass the Overnight Chlorine Loss Test
 
Follow the SLAM Process. Test for FC using the FAS-DPD only. No other tests until SLAM is complete.

pH testing is invalid when FC is above 10 ppm.
 
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