Hi - I have been using the TFPC method for about a year now, with terrific results. My water balance has been good with the use of the Stenner pump (although I just had to replace it after about 8 months use - for the first 4 months added bleach manually) and I have to add acid 2-3 times per week to lower pH.
My current levels are:
Since the Pool Calculator recommends 70-90+ for TA, when it gets down to 80 or so I add baking soda. I recently added some and it is a little high now at 120. I have Aqua Blue Pebble Sheen and the recommended level on their website is 80-120, so I overshot with the baking soda. When reading the lengthy post on adding borates in Chem 201, it is often mentioned that people keep TA at 50-60 and this seems low. Is there an advantage to keeping it below the "recommended level"? I know for SW pools the target level is lower, but I thought I saw this mentioned for plaster/pebble pools also.
Since the pool is now one year old, I am thinking I would like to add borates to see if it reduces my acid utilization and since the TA is more difficult to adjust after adding the borates, I would like to understand the best TA level first.
Thanks for any assistance!!