Opening pool with massive algea growth

[TomDehoff]

Update for today; Added 3 gals last night ended up with the following readings. TC 18, CC 1, FC 17; This AM had TC 15, CC 1, FC 14. This is the forth day of 3 gals/day chlorine addition. Is this normal in the battle to clear up the mess from the degradation of the CYA over the winter??? Been losing 3 to 3.5 ppm overnight the goal is just a 1ppm loss correct?

[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.