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update: still lost FC yesterday in sunlight - topped off to 20 at night FC held to 19 this morning, CC < 0.5, water clear I might run my CYA up to 60 and see if that helps FC drop during daytime. thanks for the help.

Thanks for the support! Here is an update: topped off and checked last night (water clear as it has been all along) 10:40 pm FC 31 this morning 5:45 am FC 30 CC < 0.5 (no pink with indicator) 10:20 am FC 23 CYA 47 CC < 0.5 11:40 am FC 20 So, I had 1 ppm drop over night, water is clear, CC <...

yes, I agree, thanks. I double checked just now using a 10 ml sample (0.5 ppm resolution) - got what I expected given I added 5 an hour ago - it held at that value for an hour. And, the CC was 0.5 CC or less. Barely any pink when I added the indicator. So, my CC numbers in the table above are...

update: you can see in my notes below I am battling a chlorine guzzling monster (that is hiding in clear water) is this what SLAMing is like? I'm not sure I trust these CC numbers date time FC CC 26-May 7:50 PM 33 shocked > 20 26-May 9:00 PM 32 two hours later still holding 26-May...

I opened the skimmers after the pool co. left because I had to get the water level up. They pumped antifreeze out of those, but I did notice a brief flash of pink when I opened those skimmers. That was three weeks ago, think that was enough? Another thought is that my lawn service might have let...

thanks for confirming. A related question - I skipped the pool company's Nature2 cartridge install on opening this year. Would that have helped me avoid this? I can't figure out what is brewing in the pool and why.

Hey community, My pool was opened three weeks ago. Things have seemed to go well so far with the method, I began managing my own chemicals last year using this site. Here are a few recent measurements (Taylor K-2006c kit) FC (variable) CC 0.2 pH 7.5 ALK 90 CH 280 CYA 50 water: clear pool...

Quick question: my in-ground pool (plaster) is closed for the winter, and the spa stays open. During the season, they share water via a spillover. For the winter with spa only, I am wondering whether I should shift to suggested ranges for spas in the pool calculator, or stay with the...

thank you, all great info! I will also reduce my pump cycle time, that should help. good point!

Thanks for the reply, Texas. So, new plaster is not the cause this time, but that is good to know. The spillover is my likely source. It is one foot wide and the water falls about 2 feet from the spa into the pool. The elevated TA is really what motivated my post. Yes, I did read and use the...

Hey TFPC community, Thanks for the great site and helpful info! I moved into a house with an in-ground pool/spa with spillover a while back. Because of this site, I transitioned the pool this summer to manual dosing of 10% liquid chlorine. After years of trichlor tabs for this pool, the CYA had...