The Culligan Compatible CTA-16-C Reverse Osmosis Membrane made by Desal is a 16 gallon per day membrane that can be used in several RO systems including the Culligan H5 and H53 RO systems. The CTA-16-C is also known as CTA-16C, 00-4428-45, 01-0001-45, M-C1812C10 and part number 1224433.