Sorry, it's never worked out to try to help with pools outside N. America, or really, even the US. Chemicals, equipment, and testing supply availability are too different from what we have here.
You are welcome to browse, and I'll post below methods you can use to search a number of US based pool forums.
I will tell you that ozone is not a practical method of commercial sanitation pool sanitation. The reasons have been explained -- at great length -- too many times here, though people usually don't believe them, till it's too late and they have wasted the money, and experienced the failures, for themselves.
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