Chlorine drop pretty fast

[CarlD]

Why are you pushing for a low FC? If your CYA is 50 (and if you're still dissolving CYA it's going to go up) your suggested FC range is 3-6. That's for CYA of 30-50--and you want to go to the low end of that while on the high end of the range.

And if your CYA goes up some more, you'll be in the 60-90 range where suggested CYA i5-10.

So again, I have to wonder if you're looking to keep your FC too low.

BTW, I am in no way contradicting FBU's assessment.

[rdefino]

I wasn't sure with a range of 3-6 for Fc, if I should be in the middle with 4-5. Should I always stay closer to the high end?

thanks

[CarlD]

Personally, I prefer to, but that's me. But I do suggest that you look at your CYA range, you probably should pick the same part of the FC range. So if you're in the 60-90 CYA range, with a recommended FC of 5-10, if you're closer to 60, then an FC of 5-7 should be fine. If you're closer to 90, you may want to keep your FC in the 8-10 range.

But, if your FC is dropping by more than 1ppm overnight, you're either too low or you actually need to shock your water.

[FormerBromineUser]

Yup. I hope Carl's explanation made sense to you. He is one of my mentors and has the experience to go the distance. Trust him!

I also shoot for the high end, stuff happens... and the added insurance can pay off.

As for CYA, if you have made no additions since May 29, go ahead and retest your CYA. Then you will know the appropriate range you need for FC to keep your pool sanitary.

Once you have that new CYA value, remember to test regularly and add enough chlorine so that your FC will never fall below the lowest recommended ppm. (Keep in mind what Carl said about looking at where you are on the CYA range and adjusting your recommended FC accordingly).

I mentioned on your other thread to shoot for FC around 10% of your CYA. That's a ballpark value for normal CYA ranges.

Good luck!