Water Filtration Systems: When Well Water Is Not Safe to Drink
Iron, manganese, hardness, nitrates, bacteria—what the test report shows and what type of treatment each requires.
A drilled well does not automatically mean drinking water. It just means water—that’s all. The only way to know what’s in it is through an analysis report issued by an accredited laboratory, based on a sample taken properly—not from a faucet left running for ten seconds.
What’s Required for Analysis
The minimum analysis covers the parameters that determine potability: iron, manganese, hardness, nitrates, nitrites, ammonium, sulfates, conductivity, pH, turbidity, plus the microbiological profile. Without these, no decisions can be made—a filtration plant is sized based on values, not impressions.
It’s worth repeating the analysis every few months, especially for new wells: the composition changes after periods of heavy rainfall or after the well has been in constant use.
What Each Stage Addresses
- iron and manganese: oxidation followed by filtration through a catalytic bed—the cause of yellowish-brown stains on plumbing fixtures
- hardness: softening with ion-exchange resins, regenerated with brine; this eliminates scale in the water heater and plumbing system
- Nitrates: specific ion exchange or reverse osmosis; not removed by mechanical filters
- Turbidity and suspended solids: mechanical prefiltration, mandatory before any other stage
- Bacteriological treatment: disinfection with chlorine or ultraviolet light, as the final stage
The order matters just as much as the equipment: a UV lamp placed before the mechanical filter does not disinfect, because suspended particles block the UV light from reaching the bacteria.
Sizing and Maintenance
The system should be selected based on peak instantaneous flow rate, not average daily consumption. An undersized system reduces water pressure in the home every time a shower is used, while an oversized system costs more and regenerates less frequently than it should.
The aspect everyone underestimates is maintenance: salt for the water softener, backwashing, replacing cartridges, and replacing the UV lamp annually even if it still emits light. An unmaintained system produces water of poorer quality than untreated well water, because the filter media itself becomes a source of contamination.
Services covered in this article
We deliver the work described above in Brașov and across the county.