Ten to fifteen years for the system as a whole, provided the consumable components are replaced on schedule. The housings, faucet, storage tank, and fittings are what determine that lifespan — the filters and membrane inside are wear items with much shorter lives of their own.

Two Different Clocks

It helps to separate the system from its consumables.

The consumables are the sediment pre-filter and carbon pre-filter (six to twelve months), the RO membrane (two to five years), and the post-filter (annually). These are expected replacements, not failures.

The system is the manifold, housings, storage tank, faucet, tubing, and valves. With reasonable maintenance these run ten to fifteen years, and often longer.

When someone says their RO system “died at four years,” what usually happened is that the membrane failed early because the pre-filters were neglected.

What Actually Ends a System’s Life

The storage tank is typically first. It contains an air bladder that pressurizes the treated water and pushes it to the faucet. Bladders eventually fail, and when they do the tank delivers a fraction of its capacity — which presents as slow or insufficient production.

Tanks can be replaced individually, which is often worth doing on an otherwise healthy system.

Housings and fittings are next. Plastic housings become brittle with age and eventually crack or fail to seal at the O-ring. A housing that will not stop weeping after a filter change is telling you something.

The faucet is the third common failure, and it is usually just wear on the valve cartridge.

Water Quality Sets the Pace

In the Hill Country, hardness is the dominant factor in how long an RO system lasts.

Calcium and magnesium scale the membrane, reducing output and shortening its life considerably. An RO unit fed by softened water lasts meaningfully longer than one fed hard water directly, which is why we frequently install a water softener upstream and treat the pairing as a system rather than two purchases.

High sediment and iron accelerate pre-filter loading, which matters most on well water. Chlorine in municipal supplies destroys RO membranes directly, which is the entire reason the carbon pre-filter exists — and why letting it exhaust is the fastest way to ruin an expensive component.

Getting the Full Life

Change pre-filters on schedule. This single habit does more for system longevity than anything else, because those filters exist to protect the membrane.

Sanitize annually. The storage tank holds treated water at room temperature for years, and periodic disinfection keeps that from becoming a problem.

Check tank pressure during service. An out-of-spec bladder quietly reduces capacity long before it fails outright.

Address the incoming water quality rather than asking the RO system to handle everything. Sediment, hardness, and iron are better dealt with upstream — a whole house water filter reduces the load the RO system has to carry.

Signs It Is Time to Replace

Production that stays slow after fresh filters and a verified tank pressure. Persistent leaks at housings that reseal poorly. A tank that will not hold pressure. Taste that does not improve with new filters and a new membrane. Or simply age past fifteen years with multiple components failing in sequence.

At that point replacing the system is usually cheaper than replacing its parts one at a time.

What Replacement Buys You

Newer systems generally produce more efficiently, wasting less water per gallon of product, and use quick-connect fittings that make future filter changes faster and less prone to leaks.

If your household has grown or you have added a fixture — an ice maker, a pot filler — replacement is the moment to size for actual demand.

Keeping It Simple

Most homeowners do best putting RO service on a schedule rather than tracking it themselves. That is covered under our Care Club maintenance plan alongside your other plumbing maintenance.

We install and service reverse osmosis systems throughout Fredericksburg, Kerrville, Boerne, Comfort, and the surrounding Hill Country. Contact 72 Degrees or call (830) 468-5316.