Time for new Salt Cell?

[FightingGobbler]

Hi. Probably time for a new salt cell, but would like to confirm I'm not missing anything. My T15 consistently reads salt level lower than measured by about 70-75%.

So questions:
Based on numbers below, is it time for a new cell?
If so, I'll just get a new T15. Any suggestions on a reputable company to purchase from? I've had mixed quality from Amazon.
Any specific procedures to get the new one running? Can I just plug it in to box and plug flow meter in and go?

Actual salinity is 3200 ppm using K-1766 drop test. And that level dropped as expected after 2 inches of rain last week.

Numbers from salt cell:

Off readings:
2700 ppm- Average
91 degrees
32.7 V
0.00 A
75P
0 ppm - Instant
Al - 0
r 1.59
t-15

Polarity 1:
2700 ppm- Average
91 degrees
27.4 volts
5.60 amps
75P
2100 ppm - Instantaneous.

Numbers are very similar when I flip polarity.

Numbers above are after I cleaned cell. I've never seen any scaling. However, I was told by installer to acid wash it EVERY time I performed maintenance. Realize now that probably shortened life span.

Cell Serial number: 3E16232
Box Serial number: 3A16235

Thank you!

 

[ajw22]

@JamesW new cell?

 

[JamesW]

Why is the average salinity so much higher than the instant salinity?

 

[FightingGobbler]

Instantaneous and average salinity were inline with each other about a month ago....in the 2600-2700 range. At that time, actual measurement using K-1766 was about 3400.

Since, then we've gotten about 10 inches of rain here. I've drained water and added salt a few times. Could there be an inertia with the average salinity resulting in discrepancy?

For what's it worth, I've never reset the average salt reading.

 

[JamesW]

Possibly a failing cell. Maybe give it a little bit more time to tell for sure. Maybe test a different way to be really sure about the actual salinity.

 

[FightingGobbler]

It's definitely still generating...just confirmed that. Was thinking of adding salt to get to actual salinity up to 3400 to try and "make the cell happy".

I'm guessing once the average salinity (as measured by the cell) falls below 2500, it'll stop generating?

Regarding other method of testing...do you trust the pool stores?

If this is an aging cell...any recs for trusted sellers? Also, are new cells "plug and play"? Perhaps, after resetting the average salt on the control unit.