Lamotte Waterlink Spin Lab Vs Taylor Drop Test

matt_a_s

New member
Aug 12, 2016
1
Boston
Hello,

I brought my spa water for testing at two separate places with the following test results:

1st place (using taylor testing chemical drops)

free available chlorine: 5
total available chlorine: 7.5
calcium hardness: 50
cyanuric acid: 0
total alkalinity: 100
ph: 7.4

2nd place (using LaMotte WaterLink SPIN Lab)

free available chlorine: 3.32
total chlorine: 21.33
calcium hardness: 0
cyanuric acid: 15
total alkalinity: 76
ph: 7.3

With these results, I'm baffled as to why the test results are so drastically different in regards to the total available chlorine. The first place testing at 7.5 ppm compared to the 2nd place testing at 21.33 ppm????? Has anyone ever received similar test results for the total available that appear to be this drastic in comparison? One place is obviously totally off here and I'm not sure who's test to believe. Although, I've read a number of postings that the Taylor drop testing is more accurate. Therefore, any thoughts would be appreciated.

Regards,

Matt
 

tim5055

Mod Squad
TFP Expert
LifeTime Supporter
May 11, 2014
10,818
Franklin, NC
Welcome to TFP!

They are so vastly different because we find that most pool stores are horrendous at water testing. We don't recomend anyone go there to have water tested. We recomend you get your own quality/accurate test kit and use it for your own testing.

Also note, that yes, Taylor drop testing is better testing in our opinion, but only if done correctly. Most pool stores don't get it right, even when using Taylor tests.
 

pooldv

TFP Expert
Platinum Supporter
LifeTime Supporter
Moderator Emeritus
Aug 10, 2012
25,412
FL panhandle
Welcome to TFP!

Thanks for showing yet again that pool store testing is unreliable and that we are correct to recommend that people test their own water at home with a good test kit like the TF-100 from TFTestkits.net. :)
 

Brian VT

Well-known member
Nov 22, 2015
87
VT
I wish you (OP) could have also supplied your own results.
Please repeat after you get your own test kit. :D

I have screwed up with a test kit. I might anticipate how many drops it will take before changing the color so I "cheat" and add more than one drop at a time. Then I blow right by the indicator and have to start over. :rolleyes:
The guy at the store might do the same but not bother to start over. He just gives you a number.
 

Eauclaire

Active member
May 28, 2015
38
Quebec, QC
It would be interesting to obtain 'same operator' statistics on the Lamotte Spinlab. The cell filling phase requires a repetitive light touch to prevent over or underfilling. The printed computerized suggested 'corrective measures' are usually overkill; trying to correct every little deviation on every single measured variable. Some AI is clearly missing here.
 
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cjbyrd

Active member
Mar 24, 2016
27
Destrehan, Louisiana
My local ACE uses the WaterLink Spin computer test. Sometimes it's close to my taylor kit results and sometimes it's way off.
 

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