Photo 1 of Big Blue CTO Carbon Block Water Filters 4.5" x 20" Whole House Cartridges by Ronaqua (2 Pack)

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Photo 1 of Big Blue CTO Carbon Block Water Filters 4.5" x 20" Whole House Cartridges by Ronaqua (2 Pack) Photo 2 of Big Blue CTO Carbon Block Water Filters 4.5" x 20" Whole House Cartridges by Ronaqua (2 Pack) Photo 3 of Big Blue CTO Carbon Block Water Filters 4.5" x 20" Whole House Cartridges by Ronaqua (2 Pack)