T cell 940 - is my cell failing?

[pgershon]

I use a digital meter to read my salt level. It registers a steady 3400 every day for last two weeks or so. My 2+ year old Hayward 940 is reading 3100 most of the time. Instant reading is 3200 at one polarity and 3100 at the other.

I am concerned that my cell is showing signs of failure. It has a 4 year warranty and I reached out to Hayward before end of its second year. Unfortunately, they say I must find a local authorized repair facility. Website lists one, and they are too busy to look at my cell this summer (claim they only service their regular weekly service customers).

What should I do? Do I live with cell until it fails, or until end of season when local outlet will probably deal with me? Downside is that warranty is prorated and I lose a year of coverage, I think.

Guys who did install no longer service my pool and last thing I want is to bring them back (you don’t want to know what I paid for the installation- and I doubt anything was wrong with my old Jandy)

 

[ajw22]

What makes you think you cell is failing?

The AquaRite uses the performance of the cell to determine salinity. For each cell (T-3, T-5, T-9 OR T-15), Hayward knows the performance of a properly functioning cell at each temperature and salinity combination. The higher the salinity and/or water temperature, the higher the performance (chlorine output).

To get the performance of the cell, divide the instant salinity by the actual salinity. If the ratio is less than 75%, it's time for a new cell. For example, 2,000 (instant salinity) ÷ 3,600 (measured salinity with a test kit)=56%. Check the cell and clean it if necessary. If that doesn't work, it's time for a new cell.

You should get the Taylor K-1766 Salt Test to use at times like this.

But assuming the 3400 is correct then your cell performance is 91%.

 

[JamesW]

The cell is probably fine.

Check and clean if necessary, but only if necessary.

Get a K-1766 salt test kit.