What is a normal ppm FC drop in a pool with my readings?

[Clyde]

Hi. Yesterday my FC was at 10 ppm (my CYA is high at 90). CC is zero. The CYA/FC chart on this site said to keep my FC at 10. I've been doing so with liquid bleach ($2.97 for 121 oz. of 8.25% at Walmart!).

Today, I tested again. FC was a 9 ppm. CC is zero. Therefore, in one day, I lost 1 ppm.

Is this a "normal" FC drop from one day to the next? Also, I am new to all of this, so is the FC just naturally "burning off", or is there some organism eating the FC (don't laugh, please).

Thanks.

 

[YippeeSkippy]

Yes, you can easily expect to lose 1-2ppm a day to the sun, even with your high CYA.

If you are unsure if there is something in the water consuming your FC, you can perform an Overnight Chlorine Loss Test--> Overnight Chlorine Loss Test

Yip

 

[JamieP]

That sounds like a great amount to lose to me! I'm losing over 3.5 ppm a day here south of Dallas. Remember, even in a perfectly clean pool with no swimmers, FC will be burned off by the sun (on cloudy days too.) So it sounds like you're doing fine to me.

 

[chayne]

i usually have to add half of a gallon of liquid chlorine 10.25% every other day to my pool. we are having over 100 degrees days for the last 6 days straight here by the red river. i even half to add about 2-3 inches of water every 3-4 days. the sun and heat just eating it all up.

 

[Chasmengr]

My chlorine loss is about 3ppm/day with CYA ~30+.