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

[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

[PoolDoc]

Ok. I've talked with Chem_Geek, and his thoughts confirmed mine. Add your second set of no-sun readings that pretty much eliminates possibilities other than the ones I mentioned.

But . . . Chem_Geek noticed some things I hadn't about the way you described your CYA testing.

So

#1 - K200x CYA testing is turbidimetric: the water gets CLOUDY when CYA is present.
#2 - You fill the small sample bottle to the first line with pool water and then add CYA reagent to the 2nd line.
#3 - Shake, wait 15 seconds, shake again, wait 45 seconds.
#4 - Then, carefully add this mix to the small CYA tube side of the kit, adding slowly, till the black dot disappears.
#5 - Stop adding when it disappears, and read your CYA level from the outside, matching water level with the marks.

BUT . . . if you the mixed sample water doesn't get cloudy, you have little or no CYA.

Ben

[shub_31]

Ill try the cya again that way but im running out of regeant. I test thsi mourning and it was FC 12 CC 1 with no drop over night. I added 3 qts and just got home. After wife son and dog swam my FC is 5 and my CC is 2. This is a first. Im ready to give up