What is the difference between Thin Film & CTA Membranes?
Date: Wednesday 16 July, 2008
CTA Membrane can tolerate chlorine, and has a rejection rate of 85-95%.
TFC membranes require chlorine to be removed from the feed water, and have a higher rejection (95-98%) and longer life than CTA membranes. Click to view the complete answer
CTA (Cellulose Triacetate) membrane is a paper by-product membrane bonded to a synthetic layer. CTA membranes are made to allow contact with chlorine in the water. These require a small amount of chlorine in the water source to prevent bacteria from forming on it. CTA membranes have a rejection rate of 85-95%.
TFC (Thin Film Composite) membrane is made of a a synthetic material, and requires chlorine to be removed before the water enters the membrane. Chlorine will cause irreversible damage to a thin film membrane element - for this reason, carbon filters are used as pre-treatment in all residential reverse osmosis systems using TFC membranes. A Thin film membrane has a higher rejection (95-98%) and longer life than the CTA membrane.