Feb
26

Question: What’s the difference between a CTA and a TFC Reverse Osmosis membrane?

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Answer:

A CTA (Cellulose Triacetate) membrane is a paper by-product membrane bonded to a synthetic layer. Due to its cellulose composition, a CTA membrane requires chlorine in the water source to keep bacteria from forming on it. A CTA membrane has a rejection rate of between 85 – 94%. CTA membranes have an average life expectancy of 18 to 24 months and are considered inferior to TFC membranes. We offer only TFC (Thin Film Composite) membranes which are made of a synthetic material. A TFC membrane requires the chlorine to be removed prior to the water entering the membrane. A TFC membrane has a rejection percentage rate between 95 – 98% which is much higher than the CTA membrane. A TFC membrane will last between 2 – 5 years. Many hospitals use TFC membranes in their hemo-dialysis (Kidney) machines because of the higher purity water they produce.

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