FC Burn Off

[cwbcss]

Hey everyone and first off let me say thank you for all of the past threads and posts that have helped me understand the proper way to maintain my pool. With that being said I am seeing significant FC loss from morning until evening.

Right now these are my current numbers

FC 5
CC .5
PH 8
TA 100
CH 215
CYA 90

I have crystal clear water, I know my CYA is high but I’m trying to manage it until it comes down over time. I spent all last year and early part of this year with the tabs until I switched to liquid chlorine. CYA was at 110 and I did a partial drain.

I am following the guidelines for FC ( I use 10% liquid) in relation to my CYA, I have done the overnight test and have held my FC and CC is at .5. Overnight I got my FC up to 11.5, morning it tested at 11.5 and by 6 this evening the FC was 5. This same scenario plays out almost everyday. According to a number of posts I have read, that loss seems really high…….. am I missing something? Pool bakes in the sun from about 11am until 6/7pm. And swimming load is only my wife and I late in the day early evening.

Appreciate any insight and if I am missing something critical I would be grateful for the course correction.

 

[PoolStored]

First, you are allowing your FC to get below minimum. Revisit this for your FC range for your CYA of 90. Link->FC/CYA Levels
Your FC, WHEN YOU TEST, should be in range. If you need to dose higher, so by the end of the day when you test again, you are still in range, do that. Min is LAVA!

6.5 is a bit extreme, but we are nearing summer solstice and with sun and swimmers, without a cover, not unreasonable for this time of year. With a cover this time of year, with sun and swimmers, I can lose 5.5...but my pool gets some shade in the afternoon.

If you are passing OCLT, then just get that FC up and keep it in range at all times. Solstice will pass.

 

[cwbcss]

Thank you for the reply, I have been seeing a more consistent per day drop around the 6-6.5 so yes I need to up my FC level to not hit that minimum. Just was very curious about how much that was dropping and if something else was going wrong. Appreciate it and I’ll get that FC up even more!

 

[PoolStored]

Minimums are: