Do you have clean out build up in the filter? What kind is it?
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AquaHomeGroup 20 Stage Shower Filter with Vitamin C E for Hard Water - High Output Filter to Remove Chlorine and Fluoride - 2 Cartridges Included -Consistent Water Flow Showerhead Filter https://a.co/d/62CDuk0
This reminds me that I am overdue for ordering replacement cartridges.