green pool..see details

[PoolDoc]

35K gallon pool is about 1/3 of a million pounds. 10 gallons of bleach would be about 15 ppm in your pool. ((1,000,000/350,000) x (10 x 0.51))
A really bad algae infestation can eat that for breakfast and be ready for lunch a few hours later!.

Use an OTO drops kit to test. Add bleach, 10 gallons at a time in the EVENING, till you get to dark orange OR the algae dies.

Run your pump/filter 24/7.

Do NOT add other chemicals including clarifiers -- they are not stable with chlorine at those levels.

Do add a dose of acid -- whatever it usually takes to lower your pH a notch -- but no more. Your pH tests will ALSO not be accurate at the chlorine levels you need to go to.

If your pool has a really bad algae load -- and it sounds like it does -- think in terms of 50+ gallons before you're done. If you want to finish quick AND you have a concrete pool, you can go ahead that in all at once. It's a lot of bleach, but cheaper than algaecide, and faster. BUT, none of your pool tests will be valid till levels drop below 15 ppm (~ orange with OTO)

********* Do NOT do this if your pool is vinyl ************

The colored print on vinyl sheeting used in pool varies in susceptibility to bleaching. If you're unlucky, you may have sheet that will bleach at the 25 ppm you're headed toward. If you're lucky, you might have liner sheeting that will withstand 50 ppm. But 50 gallons of bleach in your pool all might briefly reach 75 ppm, and I'd be surprised if you didn't noticeably lose color.

PoolDoc