While I watch my pool cure waiting for the next stage to begin, I decided to plan my pool startup strategy. I received my TF Test kit 3 weeks ago. Over the last 3 weeks I have tested the fill water 4 times. Against the polular belief that all Phoenix valley well water is hard, mine is not. CH over 4 tests 50,75,50,50 TA 120 for all 4 tests pH above 8.2 all tests. I am thinking a Bicarb startup would be the recommended route with such low CH. Plaster will be Finest Finish Mini Pebble. With such a low CH will I need to use the barrel fill method due to the high volume of Baking soda I will need to add? How do I calulated the baking soda requirement? Pool Math does not have an option of it. I know I have time but I like to plan ahead and not rush around at the end.