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Kureg did similar when the 2.0 model came out a while back. They were so kind to protect me and my device from unapproved use. They were sued and lost and now you can use any pod in them again.
I think that it goes by the average salinity and not either instant salinity.
Yes, I am configuring the controller for a T-5 cell (smaller) even though the old cell is a T-15 model (larger).
I have a bunch of old cells leftover. The biggest problem I can see is that it's unknown how long a used T-15 cell will operate in T-5 mode. A couple days, a couple weeks, or a couple months? Each cell will be different. It's not like there is a hour clock built into the cells. Theoretically, Hayward could do so but they just want to get thru the three warranty any way they can and if the cell does 6000 hours or 10,000, Hayward could care less so why tell the customer anything and get more phone calls.. The more unaware a consumer is the better for Hayward is their thinking imo..
So why is that a problem? There is plenty of warning before the cell completely fails in T-5 mode. At <2700 ppm salt reading, a low salt warning shows up but it is just a warning and nothing happens. At <2500ppm, the unit will shut down. But again, this does not happen overnight so you can easily plan for the eventual failure. It is a fairly slow and predictable process.
Hayward would never condone doing this so I am not sure I see your point here. This isn't something where the manufacture needs to get involved. The only point here I am trying make is that there is more life to the cell than what the unit indicates.
