SOURCE: How do I change the filer in my Culligan unit?
Turn the water off IN & OUT, (If this is a Culligan pre-filter it may have the shutoff valve on top), Press the red pressure relief button and hold it down for several seconds. Use the wrench provide and unscrew housing. Clean out the housing, lubricate the o-ring with silicone lube, replace filter and housing. Only tighten the housing by hand. Turn incoming water back on. It helps to hold the pressure relief button down after turning water back on to purge the air.
RJ
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