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Have a whole house water filter or water softener? After several years of use it will stop working properly because the media inside has run it's lifespan. You can choose to buy a whole new filter or you can save a bit of money and just change the media yourself. If you choose the latter US Water Systems takes you through the steps with this video.
This process works on a US Water Systems WHole House Filter like the Bodyguard, or a water softener like the Matrixx or even for a Salt-Free System like the Greenwave.