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The WaterSentinel brand of water filters are designed and engineered by water treatment professionals with over 50 years experience in the water treatment industry who understand water filtration products and who have designed many of the filters you see in the marketplace today. Also, all WaterSentinel filters carry a 90 day unconditional money back guarantee. WaterSentinel branded products are designed to improve water quality for you, your family and your pets. WaterSentinel products are also designed to help improve the efficiency of your appliances and help to protect them from the damaging effects of hard water.