CC is .5 ppm....algae bloom?

[PoolDoc]

The thing I want to know is how to spot a potential algae bloom so I can take evasive, swift action.

On a vinyl pool, the sides get slippery first.

BUT, the universal pre-algae marker is . . . you let your chlorine get low! You should assume anytime that happens, you are on the verge of an algae outbreak.

[Watermom]

On a vinyl pool, the sides get slippery first.

Interesting. I actually think on my pool I usually notice the bottom getting slippery first.

[PoolDoc]

Could be. I wouldn't have noticed, because I've never owned a vinyl pool. It's something I learned from servicing them . . . which I rarely did from inside the pool!