Hi Team,
I'm back again...after being gone for 3 weeks. A 2-week vacation, 1 week at home and another 3-week vacation is great for me but not so good for the pool.

test results on 7/4 were as follows:

FC = 10.5
pH = 7.7
CYA = 50
TA = 90
I added stabilizer before I left town trying to get level to 70. I asked husband to check FC and pH daily and to let me know if FC got to 5 and when pH got to 7.8 so he could add acid to lower and get TA down. He says that he checked every few days and FC never got down to 5 and pH never got up to 7.8. He only added salt while I was gone. We had lots of rain and high temps of 100 for many days.

Test results yesterday:
FC = 8
pH = 8
TA = 48
CYA = 60 to 70
and, natch, I have algae again.

I am now shocking again (at 20 since CYA is 60-70).

What made TA go down like that...rain, debris in pool????

FC stayed high (somewhere between 7 and 8) so what made algae return? pH too high?

After I shock, what is next step? Raise TA? Raise CYA?

Thanks.