hello i have been using this site for about a year as i had a chlorine lock of some sort last year but have worked through it now this year i am adopting the BBB method and looking for a rough guide for amount of borax to raise ph ph is at 6.6 and would like to raise tp 7.0 min pool is 25k gallons 17x37 grecian, vinyl liner, DE filter all your help greatly appreciated thanks alex