Using water softener with BM2000

While I was speaking to Gledhill $$$ call centre the other day, spoke about putting a water softener in between the house mains feed and the BM. They said there was a risk the PHE might corrode, I guess because it is not stainless steel? They suggested a phosphate dosing thing instead.

Anyone tried this?

I am tempted to give it a try as replacing the PHE if it were to corrode after a few years is still £120. And general opinions I have read are that water softeners are much better than phosphate dosing ones. Or am I missing something else that I need to be aware of?

Thanks for any guidance.

I can see no reason for the brass of the PHE sensor to be attacked, but I'm no chemist.

Plenty of brass incorporated in plumbing systems but it takes decades to deteriorate, if it ever does.

Mike