Thank you all, really helpful and supportive community here.
We don't have any prior water metrics, we moved in after previous owners had pool closed.
We are new pool owners, so lots of learning and reading we have been doing. Had to choose a chlorination method, no to Calhypo because our CH is already at upper limits, Dichlor adds CYA and gets costly, being that our current CYA readings seem low (the black dot is still visible but hazy in the CYA test tube filled to top), assuming our liquid chlorine additions are being used up quickly.
We just put 5 trichlor pucks in feeder until CYA goes higher. Yes we have dry stabilizer, but figured the trichlor tabs are multi functional at this time... chlorine plus CYA addition together.
Pool store confused us... Said no to liquid chlorine as daily use because it makes salt levels rise which make TDS go too high.
So we decided to try the TFP method from the onset of pool ownership.