Opening pool with massive algea growth

[BigDave]

Sounds pretty normal. It taks alot of chlorine.
Stay at it, the fact that you're losing FC overnight and have a significant CC level indicates you're battling something.

[TomDehoff]

Would I help the cause by upping the dose to 4 or 5 gals overnight? That would be roughly 25 to 30ppm vs. the 18ppm that I am adding with the 3 gals? CYA is very low 10 or less.

[BigDave]

I'd be concerned about bleaching your liner. Can you dose an extra gallon in the morning?

[TomDehoff]

I could do that.

[TomDehoff]

Back with today's numbers. Last night after adding 3 Gals TC 19 CC 1 FC 18, This AM TC 14.5 CC 1 FC 13.5, Lost 4.5 ppm overnight. Pool is noticeably clearer today, the sediment that was stired up with brushing last night was the least amount yet. Its getting close to being finally cleaned up. I added 1 gals this am after I took the sample to keep the FC high during the day hopefully it helps.

[CarlD]

Back with today's numbers. Last night after adding 3 Gals TC 19 CC 1 FC 18, This AM TC 14.5 CC 1 FC 13.5, Lost 4.5 ppm overnight. Pool is noticeably clearer today, the sediment that was stired up with brushing last night was the least amount yet. Its getting close to being finally cleaned up. I added 1 gals this am after I took the sample to keep the FC high during the day hopefully it helps.

Sounds like you are making progress. Try to keep your FC between 10 and 15 unless you are less worried about liner bleaching (I have a 10 year-old liner so bleaching isn't an issue to me--and it's hard to tell what is from my few "shocking times" that exceeded the Best Guess Chart's numbers....and what is from 10 years in the sun.

[TomDehoff]

Back with today's numbers. Added 3 gals had TC 18.5 CC 1 FC 17.5 after the addition. This AM I had TC 14.5 CC 1 FC 13.5 Loss of 4 PPM overnight. Pool actually is looking good. Brushed again last night and still stiring up sediment in the deep end. Added an additional gal. this am after I pulled the sample in attempt to keep FC high during the day. Wish I could get rid of the CC.