PH is OK at 7.2, but if it drops any, add Borax slowly so you won't get it too high. I'd probably do no more than a fourth of the box at a time.

Keep your chlorine at shock level. Glad it is looking better - but keep hammering it with bleach. Test it at least 3x a day and each time, take it back up to shock level.

After the pool is cleared, keep the high cl for one extra day as insurance and then you can let it drop back down. But, with cya of 70, you'll want to keep it between 5-10 ppm all the time and yes, it is safe to swim in at that level.