Drain and refill 33,000 gallon gunite pool

[bugsy0329]

I am about to call a sand truck to fill in the pool. I have been battling green water for over a week. Except for chlorine (which I didn't test b/c I have been too lazy to buy the supplemental kit), everything is in line. ph-7.6, ta-100, ch-100, cya-40. I have scrubbed and added bleach almost daily - 5 gallons at a time. The water is grass green. Oh, yeah, we're hosting a surprise party Saturday. HELP ME PLEASE!

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I am going to add more stabilizer, too.

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Added 12# stabilizer. Water is beginning to clear near steps. Maybe I panicked for nothing?

[Watermom]

I have been battling green water for over a week. Except for chlorine (which I didn't test b/c I have been too lazy to buy the supplemental kit),

Can't be lazy with a pool or you'll continue the green swamp cycle! Good luck getting your pool clear. Follow Jan's advice and hopefully your pool will look pretty good by Saturday.

[bugsy0329]

Tested for FC. It is zero. CYA is 60. Should I shoot for 15 gallons, or 20 (just to be safe)?

[aylad]

In 33K gallons of water, 11 gallons of 6% bleach should give you approx. 20 ppm of Chlorine, which is where you need to be to achieve "shock" level for a CYA of 60. After you add that initial dose,and get to 20 ppm, you need to test and add more chlorine as often as possible to maintain that 20 ppm level--that means in a pool your size, each 1/2 gallon of bleach will raise your FC by 1 ppm, so when you retest, add whatever amount of bleach you need to get back over 20 ppm. You need to hold it at or above the 20 ppm mark until it clears up and you are not losing more than 1 ppm of chlorine overnight. This is a process, not a one-time thing. The more consistent you are about maintaining the 20 ppm, the faster the pool will clear up. And...if you're planning to have a pool party this weekend, you're going to need to be very consistent about it if you want to be able to use the pool. Keep your pump running 24/7 while you're doing this, cleaning your filter as the pressure indicates, and brush the pool at least once a day.

Good luck!!
Janet