Hi. Over the past week or two I've been noticing a gradually increasing amount of algae in my pool, mostly in corners, on ladders, and along the bottom of walls. It's not bad at the moment, but it's been getting worse. I sweep it down every day, but it always comes back the next morning. Hoping someone could give me some tips!

Here's my test results for today as per my Taylor kit:

FC: 5.5ppm
CC: 0
PH: 7.2*
TA: 80
CYA: 50-60

I'm colorblind and have trouble reading the PH color chart, so that reading is what an acquaintance said it looks like. Looks the same to me but I don't trust my eyes, and my digital reader has not arrived yet.

Also, the pool was shocked up to 15ppm with cal hypo on July 23rd, about a week ago. Usually I use dichlor on the pool ('ChlorBrite' is the brand). I vacuum most days with a Pool Blaster, and usually once a week with the standard pool vac. Still my algae returns!

I try to run the pump at least 8 hours a day, although to be honest sometimes it can be as little as six. It's a Hayward Perflex with a 3/4 hp single speed superpump. Pool is 40x20 40k gallons with a vinyl liner.

Thanks!