My P.O.P. is gone. need help again

[PoolDoc]

Some. Not 4ppm between 8 & noon.

A typical commercial pool with 120,000 gallons and 200 ppd may have to add 5 - 10 pounds of cal hypo 2x per day to maintain good chlorine levels all day. But, that's 16 ppd / 10,000 gallons, where your pool is 1.5 ppd per 10,000 gallons. The only things I can think of are:

1) Your CYA test results are mistaken.
2) You've added bromine without knowing it -- very possible; those products are almost NEVER labeled as bromine or bromide.
3) You've got something causing heavy chlorine demand.

One way to check would be a pool use holiday -- 48 hours with no swimming. On the 2nd day, does in the late PM, test after 1 hour, and test again in the early AM. With 24 hours prior with NO swimming, the chlorine drop overnight should be very small. Then test again, at noon. If it's a sunny day, and you lose more than 20% of chlorine chlorine from sunrise to noon, EITHER your CYA test results are probably mistaken OR you have bromine or iodine in the pool.

If you do have significant chlorine drop from late PM the 2nd day to early AM the third day, I don't know what it could be.

If you have little drop overnight, and 10% or less loss from sunrise to noon . . . we'll need to look at what your swimmers are doing to create such a high chlorine demand.

Ben

Ben

[shub_31]

ive tested cya over and over and its no more than 100. All the kids do use lotion. And im 100% sure I have not added bromine. I just shocked again at 730. No ones been in the pool since 2. Ill check around 830 and check in the mourning. Hopefully no drop. I want to make sure I dont have algae even though Ive never ever seen any other than having a cloudy pool. And like Ive said before, my pool is the clearest its been in a while. Thanks.

[PoolDoc]

To test the way I said, you'll have to keep people out all day Monday and Tuesday till noon, retest Monday night and Tuesday AM and noon.

Ben

[shub_31]

Just tested.

Last night: FC 23
CC 1

This mourning: FC 23
CC 1

This is the first time Ive had no decrease in FC since all the advice I had been given way back. ill see what happens then test your way if I still have problems. Going on vacation next week so no one will be in the pool then. Thanks

[shub_31]

tested again.

This mourning FC 23


4:30pm FC 13


No one in pool all day, fairly sunny with some rain. Seems like a big drop for 8 hours.

[PoolDoc]

I'm going to ask Chem_Geek to look at this, but the only two explanations I know of for this are:

#1 - Your CYA is not as high as your testing is indicating, OR
#2 - There's bromide / bromine in your pool (or iodine, though I don't know how that could be.)

Meanwhile, please read this page:
http://www.poolsolutions.com/tips/on...mine-pool.html

Ben

[shub_31]

Thanks Ill read it. The only things Ive ever added is Simplicity Clear Magic, HTH water clarifier, pool brand trichlor pucks(sams club) Borax Muratic acid and years ago HTH slow disolve 3" pucks calhypo

FC 13 @ 4:30

FC 13 @ 8:00 No one in pool all day with sundown mostly after 4:30

Tested dilution method with distilled water

CA 90ppm

[shub_31]

Well, Ijust got back from vacation. No testing for 7 days. Heres what happend. Had a neighbor add bleach every day and the pump was running all the time with solar cover in place.

Sat. Rained all day. Removed 2 inches of water, tested then left.

Sat FC 15ppm
Sun added 3qts 6%
Mon 6qts 6%
Tues she forgot
Weds 3qts 6%
Thurs 6qts 6%
Fri 3qts 6%

I got home sat at 1pm. Tested
FC 7ppm
CC 1ppm.
I really expected FC to be much higher with cover on and no swimming.There was about 1inch of rain added over week. Then I added bleach tested at night. FC 12ppm. This mourning it was 9ppm. Something isnt right. Im gonna test my cya again. I really dont know whats going on. i thought we had it under control.

[PoolDoc]

Let me know your CYA level AND your water temperature, please.

Ben

[shub_31]

cya 100
temp 83F