4 Pack – Hydronix CB-45-2005 CTO Whole House Coconut Shell Carbon Block Water Filters Big Blue Size 20″ x 4.5″, 5 micron. Pack of 4 Filters, Individually Wrapped. Reduces fine sediment and chlorine taste and odor (CTO) in residential and commercial drinking water. Fits in any standard Size Big Blue Housing. 5 Microns nominal filtration. Comparable replacement to the EP-20BB & WCBCFF20. 4 Pack Hydronix CB-45-2005 (Pentek EP-20BB, Watts WCBCFF20 Comparable) Coconut Shell Carbon Block water filter cartridge measures 4.5″ x 20″ standard Big Blue size. This filters offers a 5 micron nominal filtration that is ideal for Whole House, Commercial or Industrial Use as well as use in Hydroponics. Fits in any standard Size Big Blue Housing or any Housing that uses standard 4.5″ x 20″ filters. The Hydronix CB-45-2005 reduces fine sediment and chlorine taste and odor (CTO) in residential and commercial drinking water. Coconut Shell Carbon Block. Chlorine Taste & Odor. Our mission is to offer quality filtration system and water filters at unbeatable prices. Why order from us? Sellers may NOT copy any part of this listing. The item “4Pk Whole House CTO Coconut Carbon Block Water Filter 5 micron Big Blue Size 20″ is in sale since Monday, December 19, 2016. This item is in the category “Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters”. The seller is “ifilters_store” and is located in Ontario, California. This item can be shipped worldwide.