In reading a recent thread of same topic, it appears that appropriate TA level may be determined on a case by case basis.
In the recent past, I have been maintaining TA between 60 & 70 which corresponded to a pH range of 7.5 to 8. This required ~16oz of MA every 3-4 days.
More recently, I've tightened up control on pH and am maintaining a range of 7.5-7.6. TA has been relatively stable at just above 60 (meaning I can just barely see a slight color shift on that 7th drop of reagent). I am adding 4oz MA every evening to maintain this.
My questions are:
1. Should I experiment with an even lower TA to look for more pH stability prior to adding borates?
2. What are the indications that optimum TA has been reached?
Numbers from this morning are:
TA barely above 60 (I call it 62, but is more of a guess)