I have hard water and need to stop the build up of calcium. I have 2 water heaters ran in a series and a water recirculation pump. I know I need to flush my tanks every so often but I want to treat the problem. Most things I see are for water softeners. I would go this route but my outside garden hose lines apparently are not isolated so if I use a water softener then I would be watering the grass and plants with softened water and i hear thats not so good. I dont care about the feel of soft water I just want to stop the calcium from damaging everything and causing stains. What is the opinion of whole house filtration systems? inline main water line filters? Dont know if its even worth mention "easywater" type sytems. All I want to accomplish is to stop the build up. I have city water and do not have any type of softener or filtration right now.