DUAL BIG BLUE 4.5 X 20 FILTER HOUSING WITH 1 NPT. Sediment Filter 5 micron 4.5 x 20. Carbon Block Filter 5 micron 4.5 x 20. WITH BIG BLUE FILTER WRENCH AND DUAL BIG BLUE BRACKET. Track Page Views With. Auctiva’s FREE Counter. The item “2 Stage 20 Big Blue Whole House Water Filter System withCarbon + Sediment Filters” is in sale since Sunday, June 5, 2016. This item is in the category “Home & Garden\Kitchen, Dining & Bar\Small Kitchen Appliances\Water Purification\Water Filters”. The seller is “dhillonnoni” and is located in Canyon Country, California. This item can be shipped to United States.