Home Products Replacement Filter Cartridges & Housings Page 2 The Water Doctor is an authorized sales and service dealership for Excalibur Water Systems. Replacement Filter Cartridges & Housings The Water Doctor has a variety of replacement filter cartridges as well as standard and jumbo filter housings. Filter Cartridges & Housings Melt Blown Polypropylene Cartridges / Standard and JumboView Details Pleated Polyester CartridgesView Details Polishing CartridgesView Details Polypropylene Yarn String Wound – Standard & Jumbo CartridgesView Details Standard Filter HousingsView Details ← 1 2