Jandy Aquapure PLC1400 Vastly Different than Silver Nitrate Testing

[Mcas]

New Salt Water Pool, iAqualink showing Salt about 3,200 PPM, yet my Silver Nitrate testing showing 2,600.
Two days in a row testing showed this same inconsistency. I am very experienced with dropwise testing so I don't think that's the issue.
I read a bit on calibrating the Aquapure but before I do that I want to rule out everything else.
All other chems are perfectly balanced. Aquapure set to 40% for pool and 5% for Spa.
FC 3.5
TA 80
CYA 70
pH 7.5

Any advice much appreciated.

 

[PoolGate]

The accuracy is around 400ppm so you are close. I would leave it as is.

 

[Mcas]

Today the measurement difference is about 800, is this normal? Do you recommend I recalibrate my aquapure? I did find procedures on TFP.

 

[PoolGate]

Today the measurement difference is about 800, is this normal? Do you recommend I recalibrate my aquapure? I did find procedures on TFP.

It wouldn't hurt.

 

[flynwill]

This is not uncommon, I see very similar difference in my own Jandy SWG. The SWG estimates the salt level from the conductivity of the water, and this just indicates that there are other compounds in the water contributing to the conductivity in addition to the salt. The good news is what really matters to the SWG is the conductivity. So assuming the unit is happy and making Chlorine I wouldn't make any changes.

 

[Mcas]

This is not uncommon, I see very similar difference in my own Jandy SWG. The SWG estimates the salt level from the conductivity of the water, and this just indicates that there are other compounds in the water contributing to the conductivity in addition to the salt. The good news is what really matters to the SWG is the conductivity. So assuming the unit is happy and making Chlorine I wouldn't make any changes.

Thank you, I am relying on the Silver Nitrate testing for accuracy and the SWG salt % indicator as a rough estimate.