I've just refilled my pool after draining about 7/8ths of the water due to high calcium hardness and some broken tiles. My numbers are FC, TC are.25 or less so CC is 0, PH is 6.8, TA is 140, CH is 220 and CYA is unreadable (somewhere under 25). I've read I should use bleach upon startup. Any pointers would be really appreciated.