Found the forum 3 weeks ago. This is the best way to look after a pool. History - bought a house 10 years ago with a pool - not my choice. Have spent hundreds of hours and way too much money looking after it ever since and struggled to keep it clear. It apparently won a design award when built 20 years ago but has overhanging gum tree and pines. Much debris in the pool each night and droppings from wildlife.
3 weeks ago started your process and within days it was crystal clear, and has been since - thank you so much. I can see what you mean about pool shop measurements. 2 weeks ago I though I would check how things were going and incredibly the salt measures were 10600 versus 2760, and TA 160 versus 91. Got my test kit and all is good. Built an aerator for $10 and have used around $10 in chemicals in 3 weeks with temps averaging over 30C - would normally be $30-$50 per week and the pool wouldn't be clear. And all the measurements have pretty much stabilised.
Very happy TFP member.
12k gallons or 45k litres, IG vinyl, sand filter, SWG, 1.5HP pump, 20yo