I'm so pleased to find some help with my pool. I've about given up trying all the various products from the pool stores.

Anyway, my pool is inground, 15,000 gallons. I have used a 3" tablet chlorinator since I bought the house with the pool. I took a water sample in for testing, yesterday after using a quart of Leslies copper algae control. I shocked it then circulated for 2 hours and let it sit for 36 hours before back flushing, vaccuming to waste. I was so disappointed to find the mustard algae returned overnight. It's about as bad as before I vaccumed it out.

Here are the testing results:
FC - 10+
TAC -10+
ph - 7.2
TA - 260
Calcium Hardness 500
CYA 150

They told me to add a 1/2 gal of muratic acid and test again. I added it this morning, so tomorrow I was going to take a sample in again.

I was pretty clear of algae until about 3 weeks ago when we got a midnight rain, I have a power cover, and usually close it to keep the rainwater out.

Until my test kit gets here, I have a test kit that I bought from one of the pool stores.