Ok after advice given, bleach + CYA added, test results this morning:-

9.30am

Chl - 1.0
Ph - 7.2
Alk - 120
TH - 1000
CYA - 60

now the TH test doesn't turn a real blue from red so not 100% sure I'm doing that test correctly. Pool water is clear We need to get a calcium only test but struggling to find one locally.

Any advice on these test results?

cheers
Di