Glossary
Reverse osmosis
Reverse osmosis is a purification method that pushes water under pressure through a semipermeable membrane with pores so small they hold back dissolved salts, heavy metals, nitrates, residual chlorine and most chemical contaminants. It is usually installed under the sink for drinking and cooking water, and it discards a portion of the water as reject.
What reverse osmosis is
Natural osmosis is water passing through a membrane from the less concentrated side to the more concentrated one. Reverse osmosis forces the process backward with pressure: water gets through, nearly everything dissolved stays behind. A typical home system combines sediment and carbon prefilters (which protect the membrane and remove chlorine), the membrane itself, a storage tank, and a post-filter before the faucet.
It is a point-of-use system: it treats water at one faucet, not the whole house. And it produces reject water that goes down the drain; the ratio depends on the unit.
Why it matters in Florida
Florida’s water comes mostly from limestone aquifers and arrives with high hardness, dissolved minerals and, depending on the area, a chlorine or sulfur taste and smell. Utilities deliver it within legal limits, but “within limits” and “pleasant to drink” are not the same thing. Reverse osmosis is the option that removes the most contaminants from the water you consume directly.
It is not a softener. For the hardness that damages water heaters, washing machines and fixtures throughout the house, you need a separate point-of-entry system. Many homes combine both.
Common mistake
Installing reverse osmosis “for the whole house.” Whole-house systems exist, but they are costly, waste a lot of water, and make no sense for watering the lawn or filling the toilet. Forgetting maintenance is another: the membrane and prefilters have a service life, and a system without filter changes quietly stops filtering. The alternatives are compared in water purification options.
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