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Do you need a water heater filter?
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If you have hard water or with harmful impurities, then a water heater filter https://chosenrooter.com/services/commercial/emergency/ is a must. Otherwise, the equipment may fail, and you will wash yourself with dirty water. But some people do not have such a problem - they have drinking water immediately flowing from the tap. For example, in the area where I live, this is a rarity.