Does water sample location matter???

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Farmerswife96

0
Sep 25, 2016
132
Reidsville, NC
Pool Size
29100
Surface
Vinyl
Chlorine
Liquid Chlorine
So, on a whim I decided to get a water sample from the deepest part of the pool(on the very bottom) and test it because DH and kids complain of stinging eyes and here are the results.
pH 7.5
FC 2 (I expected this since all the family was in it yesterday)
CC .5
CYA 40
TA 50 (This is concerning)
CH 250-275 (other samples have shown CH at 375)
My question is whether to use these results or test everything again. I usually get a sample from arms length deep away from skimmer and jets. Doing weekly scrub down and vacuuming today.
Thanks again TFP??
On 7/1, my FC was 2 so I added 1 gallon of 10% LC. Pucks are in floater tied near a jet.
Thoughts???
 
It does matter.

I had noticed if I sample water from the shallow end, then the deep end, there is usually
a bit higher chlorine reading from the deep end.

It's best to get your sample from the same section of deep end, about 1 foot down from the surface.

Stinging eyes when you have shown a good ph and cc rating has me puzzled. if the ph was way
off or the cc was 2 or more I would expect eye irritation.
 
borjis said:
It does matter.

I had noticed if I sample water from the shallow end, then the deep end, there is usually
a bit higher chlorine reading from the deep end.

It's best to get your sample from the same section of deep end, about 1 foot down from the surface.

Stinging eyes when you have shown a good ph and cc rating has me puzzled. if the ph was way
off or the cc was 2 or more I would expect eye irritation.
Click to expand...

Yes, I normally get my sample from the deep end midway on the end side as far down as I can reach.
My CC since testing started with TF 100 hasn't been over .5. And haven't struggled with creeping up pH. But, I have had high levels of CH and stopped adding the calcium hypochlorite.
Should I worry about the lower alkalinity? I switched to the regular muriatic acid, had been using the less fumes version which I learned was less % acid. I think it lowered the alkalinity.
 
Okay, I tested everything again, same results on everything except I noticed something that I'm now curious about. When I put the drops in to get CC, I only use 1 drop and it turns from pink to clear, so I figured .5. However, I let it sit while doing other tests and the water turned back to a very light pink again. Is this normal? Or could my CC be higher? I test over white paper on a white towel on my kitchen table.
 

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Lynnster52 said:
Burning eyes could signal PH test is off & actual reading might be lower than 7.5. What do you use to test the PH? Check exp date on the bottle if using drops. (mine is expired so on my way to Leslie's...) Good luck!
Click to expand...

I'm using the R-0014 drops that came with my TF 100 test kit, exp 4/20. ��
Got me puzzled��
 
Farmerswife96 said:
Okay, I tested everything again, same results on everything except I noticed something that I'm now curious about. When I put the drops in to get CC, I only use 1 drop and it turns from pink to clear, so I figured .5. However, I let it sit while doing other tests and the water turned back to a very light pink again. Is this normal? Or could my CC be higher? I test over white paper on a white towel on my kitchen table.
Click to expand...

Very normal & you test as I do, including the white paper towel. So all good if one drop clears the pink. Result is read immediately, because waiting will always turn it back to pink! I have no explanation for that but was my first question when I switched over to this test method this year!
 
Regarding the FC test, it keeps changing back to pink because the CYA buffer keeps releasing FC in an effort to maintain chemical equilibrium. It'll do that until the CYA buffer has released all it's chlorine (assuming enough powder was used). It's an exponential decay function so will do this forever (although by the time forever happens the amount of chlorine being released would be infinitely small).

Theoretically this means the speed in which you do the test will affect the result, but in practice it doesn't matter because in the time it takes to do the test and show clear effectively all the FC has been measured. The remainder is less than the 0.5ppm of one drop even if you waited for infinity to remeasure.
 
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