Water Conditioning
Reverse Osmosis Systems in the Twin Cities: A Homeowner Guide
What an under-sink RO system does, how to check contaminant claims, and what to ask about installation and upkeep.
Reverse osmosis uses a membrane to reduce dissolved substances in water. An under-sink system can treat drinking and cooking water, but its exact contaminant claims, capacity, and maintenance requirements depend on the model.
Begin with the water concern
Taste, a laboratory result, and dissatisfaction with an existing system are different starting points. Explain the goal before choosing equipment. An RO system should not be sold as a universal answer to any problem in the home.
CDC describes RO as capable of reducing several dissolved chemicals, while directing users to the product label for the specific claims. Avoid interpreting a general technology description as a performance guarantee for an unspecified model.
For PFAS, verify the exact claim
Check the model and cartridge against the certification listing and performance sheet. Look for PFAS reduction specifically. NSF/ANSI 58 certification alone does not mean every optional contaminant claim is included.
Some carbon-based point-of-use filters also have PFAS reduction claims. A pitcher is not automatically ineffective, and an RO unit is not automatically the appropriate choice for every customer.
Understand the installation
Discuss cabinet space, faucet choice, supply pressure, drainage, expected treated-water demand, and access for service. Some systems use a storage tank; configurations vary. RO produces a reject-water stream, so compare the model’s water-efficiency information as well as its output.
Pretreatment may be needed for some source water or equipment. Follow the manufacturer’s limits rather than assuming every home needs a softener ahead of RO.
Plan for maintenance
Cartridges and membranes require replacement. Follow the exact model’s instructions and any contaminant-specific monitoring guidance. A TDS meter can be one operating check, but it does not measure PFAS or prove drinking-water safety.
See our reverse osmosis service page, which covers under-sink and whole-house systems.
Start with the right test
The free basic in-home test checks hardness, iron, chlorine, pH, total dissolved solids, and alkalinity, plus nitrate for well-water customers. It does not measure PFAS or establish drinking-water safety.
A.J. Alberts offers separate paid PFAS testing for municipal-water and private-well customers. We collect and submit the sample and explain the laboratory report. Ask about the scope and price when booking.
Schedule a free basic water test or call 651-738-0580. For PFAS testing, identify that request when you contact us.
Sources
Frequently Asked Questions
Does every RO system remove PFAS?
Does RO require a softener?
How often should I change the filters?
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