Now u CAN take about a cup of de and put it inside your cartridge filter to increase the range of micro what-nots the filter picks up..but not in a sand filter...in my opinion
Usually the borax is gonna raise your ph level.
I would go ahead and dose the pool with the first round of borax FIRST...THEN i would worry about adjusting the ph and Ta.
Just sayin...I done it 100 times...usually just fine.
