sureTREAT and TA problem?

[jimmieg]

The store where I buy my liquid chlorine installed the sureTREAT by Taylor water tester. Thought I would give it a try as it might remove human error.

Over six weeks most readings confirm manual Taylor testing EXCEPT TA which manually reads 80. The ST consistently calcuates TA at 22* (*based on it's reading of 40 TA and a pH of 7.3). Am I that far off or do these machines give bad readings? (Note: Had two friends manually confirm my TA).
Has me concerned.
Thanks for your thoughts.

 

[tim5055]

Welcome to the TFP pool! :splash:

My first suggestion is to stop going to the pool store.

Not much credence is given to pool store testing around here. While you would think that a "professional" would be the best, unfortunately in most cases it is quite the opposite. Between employees who blindly trust the word of chemical sales representatives and high school kids working in the pool store for the summer you end up with poor results from their testing.

Also, do not confuse the specificity of the results the "computerized" systems give with accuracy. There is always a human element involved (amount of water sample used, how clean is there testing equipment, ect.).

Always stick with your numbers.

 

[jimmieg]

Thanks, Tim. Thought the digital tester/strips ( by Taylor) would remove something of the human element - bias to sell product, everybody sees color differently, etc.

 

[tim5055]

Thanks, Tim. Thought the digital tester/strips ( by Taylor) would remove something of the human element - bias to sell product, everybody sees color differently, etc.

You proved the problem yourself

Had two friends manually confirm my TA

Stick with your numbers.

 

[cfherrman]

Might be a adjusted ta

Machines will cause errors, so make sure to keep testing yourself regularly

 

[JamesW]

What's the CYA?

 

[jimmieg]

What's the CYA?

I get 40 - just did a backwash. sureTREAT says 70. It has not been 70 even before backwash.

 

[jimmieg]

Might be a adjusted ta

Machines will cause errors, so make sure to keep testing yourself regularly

It is adjusted TA at 22. But still registers unadjusted TA at 40.