They do an annual service on our water softener and water filter. Service is easily scheduled and inspection/service of both systems is carefully carried out. I feel that the service is fairly priced and that the quality of the work is excellent. I recommend Metzner's for their service.
We have the reverse osmosis system for our drinking water. (My husband didn't like the taste of well water.) We also have the water softener which makes washing clothes, dishes and showering very nice!