So let's say your pool holds 14000 gallons of water
you need to bring your ph down to about 7.4 and you must use muratic acid or a commercial ph lowering agent
chlorine is not as effective at higher ph's
If you are showing signs of green water you must shock pool to about 20 ppm. You also need a decent test kit that will read up to up to high level.
I would add 6 bottles of the 3/4 gallon size of ultra bleach, check your CL level twice a day and keep the level up till it clears.
I cant see your alk level being correct 3 x 10 is 30 not 300
if your ph is high i would expect your alk to be high but not 300 and if it is the ph lowering will bring down the alk.
You also need to post your stabilizer level
this is what protects your chlorine from the sun.
so we need you to post
Free Chlorine
Stabilizer or CYA level
PH
Alkalinity
at minimum
Take your water to a pool store and have them test but dont buy in to their chemical trap
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