What is Reverse Osmosis?
Plain-English explanation from a licensed Utah HVAC, plumbing, and electrical contractor.
Reverse osmosis is a multi-stage water filtration system that forces water through a semi-permeable membrane to remove dissolved minerals, chemicals, and contaminants — typically installed under the kitchen sink for drinking water.
Full Definition
Reverse osmosis (RO) is a pressure-driven filtration process that pushes water through a semi-permeable polyamide membrane with pore sizes around 0.0001 microns. The membrane rejects nearly all dissolved minerals, heavy metals, pesticides, fluoride, lead, chlorine byproducts, and pathogens. A typical residential RO system has 4–6 stages: sediment pre-filter, carbon pre-filter, RO membrane, carbon post-filter, and optional remineralization or UV sterilization stages.
Utah municipal water is safe to drink but has noticeable mineral taste from hardness and trace chlorine byproducts. RO water tastes like bottled water without the plastic waste — typical 3-gallon-per-day household use saves about 1,000 plastic bottles per year.
Common Questions
Does RO waste water?
Traditional RO systems waste 3–4 gallons for every gallon of pure water produced. Modern tankless RO and zero-waste designs cut that to under 1:1, and some recirculate the reject stream back to the cold-water line for use in other fixtures.
How often do I change RO filters?
Sediment and carbon pre-filters every 6–12 months. RO membrane every 2–4 years depending on local TDS. Post-carbon filter at each membrane change. We can set up a maintenance reminder service for your unit.
Related Terms
Water Softener
A water softener is a tank-based ion-exchange system that swaps calcium and magnesium in hard water for sodium, eliminating scale buildup throughout the plumbing.
Water Hardness
Water hardness is the amount of dissolved calcium and magnesium in your water, measured in grains per gallon (gpg) — most Utah cities deliver 12–28 gpg, well into the 'very hard' range.
Recent PLUMBING work in Utah
A few installs and service calls from the AYSP crew.
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