Helping friend with green pool

[MCan56]

Here are the specifics: gunite 40,000 gal pool, currently using pucks. The pool went green on him so he asked me for help. I brought my tf100 test kit over and measured...wait for it...

Fc 0
Ta 10
Ch 320
Ph <6.8
Cya 50

I then tested with his Clorox 6 way strips and got:

Th 500
Tc 0
Fc 1
Ph 6.2
Ta 0
Cya 0

I have no idea where to start. Pool math says to add 52 lbs of baking soda, should we start there and try to get the Ta and ph under control? I assume I can start throwing bleach in too, but I think pool party is definitely out for tomorrow.

 

[Mike1162]

I'd bring the chlorine into 5 - 8 ppm range then start slowly bringing up the PH.

 

[Richard320]

I'd get TA up to 60ish and recheck pH & TA again in an hour and raise pH some more and keep plugging in the TA as whatever and the pH as what you read until you get the color on your pH tester to shift. Then SLAM it. When the SLAM is done, deal with fine-tuning the rest.

 

[MCan56]

Solid suggestions, thanks!

So far we have added 16 lbs baking soda and he insisted on some copper-based algaecide. We will test Ta and ph again in an hour.

 

[kimkats]

Please tell him NO more copper Tell him that it will do more harm than good in the long run.

Kim