I just had my pool water tested at Warehouse Pool Supply. Results:
Free chlorine: 10.0 ppm
Total chlorine: 10.0 ppm
Combined chlorine: 0.0 ppm
pH: 7.6
Hardness: 420 ppm
Alkalinity: 110 ppm
Cyanuric Acid: 300 ppm
Copper and Iron: each 0.0 ppm
They tell me I have chlorine lock. I can't completely understand why I have so much free chlorine yet I get yellow algae. This just started to happen (within the last two weeks) and the only difference is I switched to calcium hypochlorite from a stabilized chlorine. If it's true that the very high CYA level is somehow keeping my free chlorine from working, how do I rectify the situation. I'm in a Texas drought and draining my pool is not really a good option. Thanks.