Question: I’ve heard that I shouldn’t use copper pipes with a RO system. Why?

Answer: Most brands of RO system will reduce 90% plus of salts in water, so you can assume the water salts concentration would be about 1/9th of the content in the feed water. The aggressiveness of this purified water towards the materials into which it comes in contact is a function of its purity. The higher the purity, the more its aggressiveness. This means the water will be more corrosive. Piping after an RO unit should therefore always be non-metallic. Don’t use copper piping after any RO system.