KX Matrikx +CTO/2, 10" x 4.5" Carbon Block FilterPart#: 32-425-125-975 (The Workhorse) Compatible replacement for Big Blue, Ametek, Pentek
KX Matrikx +5, 20" x 4.5" Carbon Block FilterPart# 02-425-125-20Compatible replacement for Big Blue, Ametek, Pentek