Description
The Water Sentinel WSK-1 contains a pre- and post-filter that fits Whirlpool reverse osmosis systems WHER-12 and WHER-18. Also can be used as replacements for the SEARS Kenmore UltraFilter Reverse Osmosis Series filters 42-38476, 38476. It is recommended that you replace the WSK-1 every 6 months based on your water quality and usage.
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