Installing a reverse osmosis (RO) system for a homeowner is not a once and done event. Just like any other kind of water treatment technology, RO systems require regular maintenance. This includes periodically replacing the unit’s pre-filters, postfilters and membrane modules. In addition, TDS creep might be a challenge.
RO systems force water, under pressure, into a module that contains a semipermeable membrane. The membrane allows water molecules to pass through while holding back (rejecting) dissolved salts and some organic substances. A typical RO system has a pre-filter designed to capture larger particles, chlorine and other substances; a semipermeable membrane that captures more contaminants; an activated carbon filter that removes residual taste, odor and some organic contaminants; and a storage tank to hold the treated water for use.