Reverse Osmosis System
A reverse osmosis system is a water filtration device used in plumbing that employs a semi-permeable membrane to remove contaminants from drinking water, typically installed under the sink for point-of-use purification.
Estimated value as of 2026 · Source: Average under-sink RO system (most common for regular homeowners) from sources
Fun Fact
Under-sink RO systems produce purified water at a fraction of bottled water costs after the first year, with annual maintenance around $80 covering filters and minimal water usage.
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