I tested at noon at it was at 7.5, I have roughly a 55 level CYA so i shoot for 7 - 9 so I added 7 cups to raise it to 11. I checked it at 9:30pm expecting it to be around 7 or 8 and find it at 5. Is this a normal loss? My water is 90F and it was really hot today and the sun is on the pool unfettered for about 9 hours each day. My overnight tests have been fine (did one a few days ago) and the water is crystal clear so just wondering if that is normal. I still haven't found a routine where I can add enough at night and not have to worry about it until the next night. Any help is appreciated.
Losing 6 FC level in 9 hours?
- Thread starter dustbin3
- Start date
No, not normal. The pool should use 2-4 ppm FC per day. What about a light, ladder, cleaner or other hiding place for some algae?
There is a ladder but I checked it out yesterday and couldn't see any problems.
I did an overnight test last night and didn't lose any chlorine and the CC's are measuring at 0.
I did an overnight test last night and didn't lose any chlorine and the CC's are measuring at 0.
Check the date code on your chlorine, maybe it is old. Typically they are listed like this 17150, which means it was made on the 150th day of 2017.
What is the average depth of the pool?
What is the average depth of the pool?
Old chlorine will only effect the actual FC level reached. If you want to know for sure, I would recommend retesting, like 15-30 minutes after you do your addition. You might not actually be getting up where you think you are at your additions.
Thanks guys, it's 26 foot round pool that average about 44" depth. I've calculated it at 14.5K gallons. The chlorine is all relatively new, I just got it from Rural King last week actually!
Some new readings to share.
Midnight FC 11
7/14
8:30am FC 11, CC- 0
4pm FC 6.5 CC- 0
added 11 cups 10% chlorine
Water Temp is 91F
I added enough Cya to raise it 20, shooting for 60 on the 10th of July, so maybe that hasn't kicked in yet? It all dissolved in a sock in the skimmer in about 2 hours.
Some new readings to share.
Midnight FC 11
7/14
8:30am FC 11, CC- 0
4pm FC 6.5 CC- 0
added 11 cups 10% chlorine
Water Temp is 91F
I added enough Cya to raise it 20, shooting for 60 on the 10th of July, so maybe that hasn't kicked in yet? It all dissolved in a sock in the skimmer in about 2 hours.
Check the bottles of your chlorine before you purchase. It doesn't matter that you bought them last week if the date of the chlorine is from 2016, which is old.
AftonJeeper suggested to look for these type of numbers on the chlorine bottle. "Typically they are listed like this 17150, which means it was made on the 150th day of 2017."
AftonJeeper suggested to look for these type of numbers on the chlorine bottle. "Typically they are listed like this 17150, which means it was made on the 150th day of 2017."
Let's see.
Midnight 11 ppm
8:30 am 11 ppm
4:00 pm 6.5 ppm
CYA should register soon after it's all dissolved. Have you checked it since making the addition on the 10th?
Midnight 11 ppm
8:30 am 11 ppm
4:00 pm 6.5 ppm
CYA should register soon after it's all dissolved. Have you checked it since making the addition on the 10th?
170171322 is the number on the side.
- - - Updated - - -
I don't have the reagent left to test the CYA again but I added 1 quart 7oz of CYA and no water has been drained so it's in there and is around 55-60
- - - Updated - - -
I don't have the reagent left to test the CYA again but I added 1 quart 7oz of CYA and no water has been drained so it's in there and is around 55-60
17 017 means the year 2017 of Jan. This is considered old which will help explain why your FC is lower. Those bottles may have 20-30% less chlorine than it advertises.