Whole-Home Water Filtration Installation — Dunkirk, MD
A Dunkirk family had orange water, a sulfur smell, and low pH that was corroding their copper pipes. Water test results: iron 4.2 ppm, hydrogen sulfide 0.8 ppm, pH 5.9, hardness 18 gpg. We designed and installed a complete treatment train — sediment filter, acid neutralizer, iron/sulfur filter, and UV disinfection — in the correct sequence for this specific water chemistry. Thirty-day retest: iron 0.05 ppm, H2S undetectable, pH 7.3.
The Problem
A family in Dunkirk called with multiple water quality problems that had been worsening for two years: orange-tinted water with a faint sulfur smell, blue-green staining on copper fixtures and the sink basin (indicating copper corrosion from acidic water), and a water softener that had been regenerating every day without improving the water quality. They had been buying bottled water for drinking. The existing softener had been installed by another company without a prior water test.
Our Diagnosis
We performed a comprehensive on-site water test. Results: iron 4.2 ppm (ferrous), hydrogen sulfide 0.8 ppm, pH 5.9 (significantly acidic — normal range is 6.5–8.5), hardness 18 gpg, coliform bacteria negative. The acidic pH was the root cause of the blue-green staining and copper corrosion — water at pH 5.9 actively dissolves copper from pipes and fixtures. The existing water softener was working mechanically but was not designed to handle iron at this concentration, and the acidic water was degrading the softener resin. The treatment sequence was critical: acid neutralization had to come before iron filtration (acidic water damages iron filter media), and iron filtration had to come before the softener (iron fouls softener resin). The existing softener had been installed in the wrong position in the treatment train.
The Repair Process
- 1On-site water test: iron 4.2 ppm, H2S 0.8 ppm, pH 5.9, hardness 18 gpg, coliform negative
- 2Designed treatment train in correct sequence for this specific water chemistry
- 3Installed 20-micron sediment pre-filter to protect downstream equipment from particulate
- 4Installed calcite acid neutralizer — raised pH from 5.9 to 7.3 (confirmed with post-install test)
- 5Installed Katalox-Light iron/sulfur oxidizing filter — removes both ferrous iron and H2S
- 6Rebuilt existing water softener with fresh resin (old resin was iron-fouled and degraded by acidic water)
- 7Repositioned softener to correct location in treatment train — after iron filter, not before
- 8Installed UV disinfection system as final stage before distribution (UV requires clear water to work)
- 9Retested water at 30 days: iron 0.05 ppm, H2S undetectable, pH 7.3, hardness 1 gpg
The Outcome
Orange water and sulfur smell eliminated within one week of installation as existing iron deposits were flushed through. Blue-green staining stopped immediately as the pH was corrected to 7.3 — the copper pipes are no longer being attacked by acidic water. The family stopped buying bottled water. The water softener is now performing correctly with the iron filter protecting the resin. The 30-day water test confirmed all parameters within normal range.
Key Takeaway
Water treatment sequence matters enormously. Installing equipment in the wrong order — or installing a softener without first testing for iron and pH — wastes money and can make problems worse. The correct sequence for Calvert County well water with iron, sulfur, and low pH is: sediment filter → acid neutralizer → iron/sulfur filter → softener → UV. Always test first, then design the treatment train based on the actual water chemistry.
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Annapolis, MD
May 2026
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Southern Maryland
June 2026
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Dunkirk, MD
June 2026
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