Reverse osmosis vs. whole-house water filtration in Mesa

A reverse osmosis membrane separates largely by molecular size and charge, so it is the category generally documented for reducing dissolved salts and metal ions. That separation is not uniform. Dissolved gases such as carbon dioxide, and some small uncharged organic molecules, pass more readily than dissolved salts do.

That is exactly why carbon stages sit on both sides of the membrane instead of being sold as optional extras. One protects the membrane on the way in. The other handles what the membrane was never the right tool for on the way out.

None of that describes a specific unit, and it should not be read as a promise about one. A category capability and a documented model capability are two different claims, and only the second one is yours.

A hardness demonstration on a kitchen counter shows one property of the water, and a clear glass proves nothing about what is dissolved in it. Ask what a proposed water and air test measures, who performs it, whether independent laboratory analysis suits the question being asked, and what the result can and cannot establish.

Then read that result against the utility's own reporting for your address rather than against a figure quoted for the city as a whole. Equipment chosen before a result is chosen against a guess, and the guess is the expensive part.

Four things decide whether a system drops in or turns into a project. Whether the sink deck already has a spare hole for a dedicated faucet, or one has to be cut into the counter material you have. Where the reject line ties into the sink drain, and which arrangement the local jurisdiction accepts. Feed pressure at that fixture, since production across a membrane falls with it and a booster pump is sometimes the only route to a usable rate. And the run to the refrigerator, if the icemaker is meant to be fed too, which in a slab-built Mesa house means going through cabinets and walls rather than under the floor.

Then leave room to work. Filters have to be changed without emptying the cabinet first, because the unit that cannot be serviced comfortably is the unit that quietly stops being serviced. Treating water where it enters the property instead is a different conversation with its own whole-house considerations.

Three complaints arrive here regularly, and none of them is solved by a tap at the kitchen sink.

Spots and white crust are hardness, and hardness is treated where water enters the property. An RO faucet never touches the dishwasher, the shower door or the water heater, so the spotting continues exactly as before. The practical removal steps are in the guide to hard water stains.

Rusty water at one bathroom with clear water at the kitchen points at a pipe or a fixture rather than the supply. Filtering the kitchen tap hides that instead of resolving it, and hot-water symptoms belong with the water heater.

A contamination worry is a testing question before it is an equipment question. Residential systems are specified for water that is already microbiologically safe. They are not a substitute for a utility's treatment or for a boil-water notice. Start with the response guide for an Arizona water-quality concern.

A distiller boils water and condenses the vapor, which is a different method with its own output rate, energy use and cleaning burden. It is also where this company started, and distiller work still turns up by name in the reviews further down this page.

That matters practically rather than sentimentally. Distillers are a shrinking niche, so parts and service familiarity are worth asking any contractor about directly, and an owner weighing descaling an existing unit against moving to a membrane system deserves both paths described honestly. The comparison of reverse osmosis and distillation sets the two against each other on capacity, upkeep and running-cost drivers rather than on the word purity, which has no single technical definition.

Keep the starting test result, the installation date and the equipment documents together, and record every filter, membrane and cleaning date against them. Without a baseline there is no way to tell drift from normal operation a year later, and the first useful question on any service call is what changed since it was working.

Use the replacement components the manufacturer specifies rather than the nearest cartridge that fits the housing. If taste, flow, drain behavior or refill speed changes, investigate rather than assuming the equipment is still doing what it did on day one. The archived RO filter exchange page explains how to verify current replacement service without implying that its prior promotion is still running.

JB's labor on water-treatment work carries a two-year workmanship guarantee: failed work is made right at no cost, excluding normal wear, manufacturer defects and damage from outside causes. Cartridges and equipment carry their own manufacturer terms, so keep that paperwork with the job documents. Where the concern is airborne rather than waterborne, indoor air quality is the separate question. To describe what you are tasting or seeing, call (480) 969-3193.