DUAL BIG BLUE 4.5″ x 20″ FILTER HOUSING WITH 1 NPT. Pleated Sediment Filter 10 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 Whole House Big Blue Water System Pleated Sediment + Carbon Filters USA” is in sale since Saturday, September 17, 2016. This item is in the category “Business & Industrial\Restaurant & Food Service\Bar & Beverage Equipment\Commercial Water Filtration\Water Filter Systems”. The seller is “oceanicwatersystems7″ and is located in North Hollywood, California. This item can be shipped worldwide.