The chlorinator doesn't stop working when the ph is high. When ph is high the CL is weaker. When you lower the ph the Cl will become stronger. It's all about chemistry.
No matter what acid you use, if the ph is kept between 7.4 - 7.6 you will get longivity out of your grout and slow down the degridation of your surface. Unless the builder has used bathroom grout! (They Do)
It's also possible that the overflow gutters and the balance tank haven't been waterproofed. I have come across this a few times here in Thailand. (Builder saving $$$) This would explain the high ph!
MrJ2U When you want glass, contact me has I supply. There are different types on market - "Eco Clear" recycled plate glass (See attached) & recycled bottleglass. The later is ????
Eco Clear wetinfo.pdf