What is a Water Heater Filter and How Does it Work?

[@rebeccahill8365]

Thanks for the clarity. My husband no longer can address 'household' issues (dementia). I learned a lot. You are an excellent teacher.

[@narutosasuke8580]

My filter is connected to the hot water side of the water heater, is that a wrong setup? Will having it set up that way still work or cause problems?