After changing another disintegrated flapper on my toilet, I wonder if
it is time to get a whole house water filter. We're on city water, but I
have to clean the aerators on the facets and the flappers on the toilets
from time to time. It also seems abundantly clear to me that there is a
racket going on in the water filter business.

Can someone recommend a good brand or model of whole house water filter?
My home has copper plumbing, and I would definitely have it
professionally installed. Does Lowes or Home Depot sell quality filters?