FYI....

One dose of "shocking" does not a cure make. I would bet that you'll need to maintain chlorine @ shock level for a day or two to make sure the algae problem does not reappear. The WalMart test kit does not test for CC, just TC. If convenient, take water sample to pool store and have them test, but DO NOT let them talk you into buying anything. Post the numbers and we'll assist further.

Good luck, and wear goggles!

CaryB