Why am I losing 2 points of chlorine in one day?

[Jkmccoy]

Last year I started the TFP plan and it worked swimmingly! We had it down to just pour one jug of bleach in each evening and we were perfect. This year, we are losing chlorine at a much faster rate. Our CYA is at 40. This morning we were at 6.5 and this afternoon we are at 4.5, so that means another almost 2 jugs to get the chlorine up to 7. Why are we losing at this rate? How can I get back to only 1 jug a day? The 2 jugs is getting expensive.

 

[mknauss]

Normal FC loss is 2-4 ppm per day.

Weather plays a big part in FC loss. Sunny days consume more FC.

You can do a Overnight Chlorine Loss Test. What is your CC reading when you test in the morning?

 

[tim5055]

2 - 4 ppm loss per day is normal with most pools.

You could take your CYA up to 50 and see if it slows the chlorine use a little. But, that raises your minimum to 4 and your target to 6-8

 

[Leebo]

Something isn’t adding up to me? Using 25k gallons one gallon of 6% should raise your FC from 4.5 to 7ppm? Keep in mind if you’re using household bleach it’s gonna use more this year as the chlorine % changed from 8% last year to 6% this year.

Also, I would suggest looking for a source with a higher percentage of chlorine per jug. After doing some math with the recient price increases 12% or 10% bleach works out to be a better deal.

 

[Jkmccoy]

According to the pool math going from 4.5 to 7 requires 130 oz of bleach. I did realize that I was basing my chlorine need on 50 CYA, but I don't need that much. To raise it to 6, which is right in the middle of my range was only one jug! Yay! My CC is at 0. So I guess I am back to it working the way it is supposed to.
Thank you all so much!