Thanks for the advice re the tester, i can readily get the tablets for all the tests except the calcium hardness ones, they only seem to be available in australia 🙄 Is the calcium hardness a really important part of testing as im not testing for it now with strips but I do know we live in a very hard water area so...?
I shocked the tub this morning going by the above so used 15g of chlorine granules (1 teaspoon apparently around 4.18g)
The readings looked good immediately afterwards, the Total Bromine was around 9, Free Chlorine about 3, and pH/TA were a little high so I added another 25g of pH down.
Just tested again a couple of hours later and took photos this time, the TA and pH high and the Bromine/free chlorine have considerably reduced.
What would you suggest I do next?