Iron: Will iron hurt an RO System?Updated 2 months ago

Iron will plug an RO membrane, as the membrane is not able to flush iron out. Trace amounts of iron (up to 2 PPM) can be removed by a water softener. If the water contains 1 PPM or less, there is no need for concern as the membrane will not be significantly affected.

Note: This refers to clear water iron, not red iron. You can tell the difference because clear water iron leaves no visible signs, whereas red iron leaves a reddish brown discoloration in toilet bowls, tanks, sinks, and tubs. If red iron is present, steps to remove the iron will have to be taken.