199 CYA even possible?!

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M

MillerCourtResort

Member
Jun 8, 2023
21
Indianapolis, Indiana
Pool Size
17000
Surface
Vinyl
Chlorine
Liquid Chlorine
I’m trying to convert a friend to the TFP method. Leslie’s test just came back with a cya reading of 199! Is that even possible? Wouldn’t she not be able to hold chlorine if it were that high?

And how did hardness magically drop from 175 to zero in a week?

Image 6405 is today. 6332 is 8 days ago. What else is wrong with these results? 18000 gallon vinyl in ground. Used only liquid chlorine this past week. Central Indiana.
 

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MillerCourtResort said:
I’m trying to convert a friend to the TFP method. Leslie’s test just came back with a cya reading of 199! Is that even possible? Wouldn’t she not be able to hold chlorine if it were that high?
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She could hold chlorine, it just would not be effective at sanitizing the pool.

MillerCourtResort said:
And how did hardness magically drop from 175 to zero in a week?
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I think you answered your question: magically. Alternatively, she could have drained her entire pool and filled it with distilled water.
MillerCourtResort said:
Image 6405 is today. 6332 is 8 days ago. What else is wrong with these results? 18000 gallon vinyl in ground. Used only liquid chlorine this past week. Central Indiana.
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If they are accurate, then nothing is wrong. But there is no reason to believe they are accurate. CH to wit. Convince her to purchase a drop test kit and/or test her water with your kit and show her what's up!
 
That is the issue with pool store testing. Especially in the summer - new temporaary help that have no experience in how to test and most likely contamination from previous pool sample.

CYA can be high and it does make the chlorine ineffective as a sanitizer.
 
MillerCourtResort said:
Leslie’s test just came back with a cya reading of 199! Is that even possible?
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I moved in my new house and inherited a 360 CYA (per Taylor diluted test) thanks to the previous owners love of tabs/shock.

It's most certainly possible, but it's also the pool stores worst test, of all their questionable results. So we particularly lol at that one from them.
MillerCourtResort said:
Wouldn’t she not be able to hold chlorine if it were that high?
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Exactly the opposite. She'd hold so much chlorine, her minimum would be a high teen or 20 in order to sanitize at the same level of any line on the CYA/FC chart. Target range would be in the mid 20s
 
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dBsooner said:
Would that require a TRIPLE dilution? :stirpot:
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Quadruple to be in the 300 to 400 range, with lots of variance error. The exact amount over 200 didn't even matter, it needed a full drain, I was just curious and with each extra dilution, it still read 100. 🤦‍♂️
 
MillerCourtResort said:
I’m trying to convert a friend to the TFP method.
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The best way to convince her is to test her water with your TF-PRO, show her the results, and then explain why the methodology promoted by leslies is in fact the root cause of the current predicament.

Interesting, if you look at the 3 step process on top of the leslies results printout, it doesn't include: Step 4. Drain Pool. I wonder why they leave that step out???????????????????????????????
 

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Katygreys said:
Interesting, if you look at the 3 step process on top of the leslies results printout, it doesn't include: Step 4. Drain Pool. I wonder why they leave that step out???????????????????????????????
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Surprisingly, they did. At the bottom of their test page, In the Problems section, the solution was to drain.
 
an1vrsy said:
Surprisingly, they did. At the bottom of their test page, In the Problems section, the solution was to drain.
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I hate to split hairs, but at the bottom they simply propose this as a solution to the problem of high CYA. Draining the pool is indeed a STEP in the pool store process. It belongs at the top with the other 3 preceding steps, and I will NOT sit by idly while this critical and final step is ignored and relegated to "solution to a problem" status at the bottom of the page!!! I demand equal representation of all steps!!! ;) ;)
 
Katygreys said:
I wonder why they leave that step out???????????????????????????????
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They have 20 products they can sell to attempt “fix” the problems.

Draining and refilling creates zero profit for the pool store.

Come on, man, it’s simple economics 101.

Step 1: Floc.

Step 2: Phosphate Remover.

Step3: Copper Algaecide.

Step 4: Silver Algaecide.

Step 5: Try floc again.

Step 6: Super Duper Enzymes.

Step 7: Monopersulfate.

Step 8: Ammonia based Yellow-Out.

Step 9: Bromide based Yellow Out.

Step 10: CYA Reducer.

Step 11: Ozone.

Step 12: Magnets.

Step 13: Voodoo.

Step 14: Drain and refill.
 
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