What Reverse Osmosis Removes
Reverse osmosis removes dissolved solids, heavy metals, fluoride, nitrates, chlorine, lead, arsenic, and most organic and inorganic contaminants down to 0.0001 microns. It's one of the most thorough filtration methods available for residential drinking water. I'm Eli, a Certified Water Specialist with over 20 years of hands-on experience installing and servicing water treatment systems across the U.S. I've seen RO systems transform tap water quality in homes across Holland, Michigan, especially where municipal water carries elevated dissolved solids or homeowners want protection from emerging contaminants.
Most people ask me what reverse osmosis actually does. The short answer is that it forces water through a semi-permeable membrane that blocks nearly everything except pure H₂O. But understanding what it removes, and what it doesn't, helps you decide if it's the right fit for your home.
How Reverse Osmosis Works
An RO system uses pressure to push water through a thin membrane with microscopic pores. Contaminants larger than water molecules get trapped and flushed to the drain. What comes out the other side is highly purified water. A typical five-stage system like the HydroClear™ Reverse Osmosis 50 GPD includes pre-filters for sediment and carbon, the RO membrane itself, and a post-carbon filter for final polishing. It's methodical, and it works.
I've installed units in Holland homes on city water and well water. The membrane does the heavy lifting, but the pre-filters protect it from clogging. That's why regular filter replacement matters. A neglected system won't perform the way it should.
What RO Removes From Holland, Michigan Water
In Holland, I've tested municipal water with moderate hardness, occasional chlorine taste, and trace levels of lead in older neighborhoods. Reverse osmosis handles all of it. It removes lead, arsenic, fluoride, nitrates, chromium-6, pharmaceuticals, and microplastics. It also strips out dissolved minerals like calcium and magnesium, which is why RO water tastes so clean but feels different than softened water.
One thing that surprises people is how well RO removes PFAS and other emerging contaminants. Testing in Michigan has shown localized PFAS detections, and while municipal treatment has improved, an RO system gives you an extra layer of control at the tap. If you're concerned about what's in your water long-term, reverse osmosis is one of the few systems that addresses such a wide range of contaminants.
What Reverse Osmosis Doesn't Remove
RO is not a catch-all. It doesn't remove volatile organic compounds like gasoline or certain pesticides that evaporate easily. That's why carbon pre-filters are part of the system. It also won't remove bacteria or viruses if your water source is contaminated, though most municipal supplies are already disinfected. For private wells in rural areas near Holland, I recommend pairing RO with UV treatment if microbial contamination is a concern.
Another limitation is that RO removes beneficial minerals. Some people add a remineralization cartridge after the membrane to restore a small amount of calcium and magnesium for taste. It's optional, but it does make the water feel less flat.
When RO Makes Sense in Holland Homes
I recommend reverse osmosis when homeowners want the cleanest possible drinking water or when testing shows contaminants that other filters can't handle. It's especially useful in homes with young children, pregnant women, or anyone with a compromised immune system. RO also makes sense if you're tired of buying bottled water or if your tap water just doesn't taste right no matter what you try.
Installation is straightforward under most kitchen sinks. The system connects to your cold water line and includes a small storage tank. Maintenance involves replacing pre-filters every six to twelve months and the membrane every two to three years, depending on water quality and usage. The HydroClear™ RO Replacement Filters Set makes that process simple.
If you're comparing options, an under-sink RO system is more thorough than a pitcher filter and more convenient than a countertop unit. It delivers purified water on demand without taking up counter space or requiring constant refills.
For broader category context, I would also review Commercial Reverse Osmosis Systems for Industrial Use. For supporting education before choosing a system, I would use Commercial Reverse Osmosis Systems.
Frequently Asked Questions
Does reverse osmosis remove chlorine from Holland, Michigan tap water?
Yes, reverse osmosis removes chlorine, but most of it is captured by the carbon pre-filters before water reaches the membrane. The membrane itself blocks chlorine byproducts and other dissolved chemicals that carbon alone may miss.
Will reverse osmosis remove lead from older plumbing?
Yes, reverse osmosis is highly effective at removing lead, even from homes with older pipes or fixtures. It reduces lead to non-detectable levels in most cases, making it one of the best options for lead protection.
Does RO remove fluoride from city water?
Yes, reverse osmosis removes fluoride along with other dissolved minerals and contaminants. If you prefer fluoride-free drinking water, RO is one of the few home systems that reliably removes it.
How much water does reverse osmosis waste?
Most residential RO systems produce three to four gallons of wastewater for every gallon of purified water. Newer systems are more efficient, and some homeowners use the reject water for plants or outdoor use.
Can reverse osmosis remove bacteria and viruses?
Reverse osmosis can block bacteria and viruses due to the small pore size of the membrane, but it's not certified as a disinfection method. For well water or untreated sources, pair RO with UV treatment for complete microbial protection.