Poor reliability

Having a problem getting Pentair to replace my chlorinator that is less than 2yrs old. They look for loopholes to avoid. As I understand it, it is pro rata warranty, so will still be out of pocket by a few grand if they do honor the warranty. Question: Should a chlorinator unit fail after <2 yrs of normal use. Is the customer expected to replace every 1.5 to 2yrs? Wouldn't recommend their products.