@melodic-jordan-81418 PureIt didn’t have an AMC. We called them on demand if stuff broke or the filters needed to be changed. This was a while ago - so around 700 bucks to 1K / year for visit + parts.
We now have Eureka Forbes which sells you a 2 - 3 year plan (1 visit / 6 months) and they are good. They call and come, change filters, fix stuff that is broken, etc. I just paid them last month. It was exactly 4,325 for 2 years. So almost 1K / visit or 2K / year. I think you can skip this and call them on demand if you don’t have an RO system because I think RO systems need more maintenance.