I added 26oz of Borax last week, the Ph rose from 7.4 to 8.2. I added 8 oz of Ph Minus (1.75 lbs per 10,000), and it is still testing 8.2 two days later. I bought new Ph reagent, thinking this is 2 yrs old now, maybe not accurate, but the new test gives the same results. I bought a new...