I have a 12x3 above ground pool. I was gone for a few days and my chlorine and pH dropped, so when I got back... cloudy water. I raised the chlorine and pH back to a normal level. I shocked the pool last night... still cloudy. I started to brush the bottom of the pool this morning to clear debris and noticed a greenish cloud when I used the brush. The nightmare of every pool owner... algea! This morning my chlorine was at a 3 and pH was 7.6. What in the world do I do now? As you can guess... I'm pretty new to the whole pool thing, so please be as specific as you can. Thanks again for your help!