We keep noticing little rust type spots on our dishes so I took a sample to the hardware store and was told I need a whole house filter. They carry a culligan model for $50 and say that I'll need to change the filter every 6 months ($10 a pair). This connects to my water supply pipe in the basement and will need plumber assistance. I went online to see comparisons of filters and couldn't find anything objective. I have searched this forum and see a lot about water tests and softeners but all I am looking for is insight into what brands of whole house filters are the best and easiest to install/maintain. Thanks.