I was skeptical about ordering this filter instead of the original Insinkerator filter, but it worked beautifully! Our water heater burned out and stopped working - I ordered a new one from Revain (thank goodness the price has come down!) Installing the system we found the source of the initial problem with the hot water - the pipework from the water supply to the Filter was completely clogged! Yes, you really need to replace this filter as directed! If the water is hard, when changing the filter, make sure to check all the supply lines back and forth to make sure they are free of limescale deposits.
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