8 pcs Big Blue CTO Carbon Block Water Filters 4.5" x 10" Whole House Cartridges Replacement filters for Amazon item B0719TYD1Y and B0723FJF93 or any standard size 10" Big Blue Housing FREE SHIPPING These can used for residential and commercial applications. Effectively removes chlorine, bad taste, odor and many impurities from tap water to offer sparkling clean and great tasting water throughout your whole house. ll our filters individually wrapped for freshness and protection while in shipment.