Alkalinity test on machine versus Taylor test kit

[Aaron19]

I checked my Alkalinity using Taylor test kit. I got 110ppm
I went to a store and they checked it to a machine, they got 69ppm only.
Then they test it to the taylor test kit, result is 110 too.
They told me to add alkalinity up. They said machine is showing 69 cause CYA is a bit high 112.
Which one is accurate? The reason I let them check is my chlorine doesn't last. I thought maybe cya is high.
Any help would be appreciated.

Thank you!

[Denniswiseman]

Trust the Taylor test kit. Pool stores are in the business of selling
Don't use alkalinity up as your TA is fine, but a full set of numbers would be ideal to see where you are at
Why don't you do your own CYA test or don't you have the K2006 which the CYA is included
How do you chlorinate?
For every 10 ppm Free Chlorine (FC) added by Trichlor, it also increases Cyanuric Acid (CYA) by 6 ppm.
For every 10 ppm FC added by Dichlor, it also increases CYA by 9 ppm.
For every 10 ppm FC added by Cal-Hypo, it also increases Calcium Hardness (CH) by at least 7 ppm
You need to balance your chlorine against the CYA as in Chlorine / CYA Chart once you have checked out your recommended Pool Levels
High CYA renders your chlorine ineffective and you need to add more as per the chart
The only way to lower it is to do a partial drain and refill if it is possible
Use these common chemicals available from most stores to balance your water
Liquid chlorine (sodium hypochlorite or plain bleach)
Muriatic acid (hydrochloric acid) to lower pH and TA
Bicarbonate of soda to raise TA
Aeration will raise pH only
Soda ash will raise pH and TA

[Aaron19]

Thank you so much for the very informative reply.

[Denniswiseman]

You're welcome
It's nice to get a response from our efforts to help others

[Aaron19]

It's nicer to have a people that willing to help and share some very important information. I'll be here for my pool maintenance. I got more issue on my pool other than TA.

Thank you!