You should be flushing them anytime you are rinsing. There is no need to take them off and rinse then in a bucket. One every two weeks is about average. They’re only $15
It varies - 2 weeks to 6months. I agree on batches, sometimes get them and they don’t last long at and then get a good batch. No need to take off. I flush mine at EOD for about 30 sec. Surprised you’re using 2.3 unless you’re not cleaning very dirty stuff.
Hastelloy spring. Supposed to be way better than stainless.
I think they had an issue with either the barbs breaking, or the gasket behind the barb blowing out. I had one fail like that last year. Swapped the o-ring out with a nitrile one, and no problems since.