I'm in big trouble - I turned water green

[Watermom]

I'm gonna let PoolDoc address most of this with you but just a couple of comments. I think the only size of box of Borax that I have seen is 4lbs. 12oz. Don't put off until tomorrow adding the first 1/2 box of Borax. Go ahead and get it in there tonight. Low pH is REALLY bad for your pool. Critical to get it above 7.0 ASAP. After a couple of hours, retest and redose as needed.

Also, baking soda raises alk a lot, but not the pH much. The low alk is nowhere near as critical as the low pH.

PoolDoc will be by shortly to direct you further.

EDIT -- Baking soda (sodium bicarbonate) and washing soda (sodium carbonate) are not the same thing. Washing soda is the same thing as soda ash.