Reverse Osmosis System Upgrade — Prince Frederick, MD
A Prince Frederick homeowner had a 10-year-old 3-stage RO system with declining output and poor taste. We replaced it with a 5-stage 75 GPD system with a remineralization stage — restoring clean, great-tasting drinking water and doubling the daily output.
The Problem
A Prince Frederick homeowner had a 10-year-old 3-stage reverse osmosis system under their kitchen sink. The output had declined significantly — filling a glass took several minutes — and the water had a flat, slightly off taste. The membrane and filters had not been replaced in years.
Our Diagnosis
A 10-year-old RO membrane is well past its service life — typical membranes last 2–3 years. The pre-filters were also heavily fouled. Rather than replace components on an aging system, upgrading to a new 5-stage unit with a remineralization stage would provide better performance, better taste, and a fresh 2-year membrane warranty.
The Repair Process
- 1Tested existing system output: 0.3 GPH — severely degraded from original 1.5 GPH
- 2TDS test: 180 ppm output vs. 320 ppm input — membrane nearly exhausted
- 3Removed 10-year-old 3-stage system
- 4Installed 5-stage 75 GPD Waterdrop system with remineralization stage
- 5Connected to existing dedicated faucet and drain saddle
- 6Connected to refrigerator ice maker line
- 7Post-installation TDS: 12 ppm output — 96% reduction
- 8Confirmed output rate: 75 GPD — adequate for household
The Outcome
Output restored from 0.3 GPH to full rated capacity. TDS reduced from 320 ppm to 12 ppm. Remineralization stage adds calcium and magnesium back for improved taste. Homeowner reported the water tasted noticeably better immediately.
Key Takeaway
An RO membrane should be replaced every 2–3 years. A 10-year-old system with a degraded membrane is producing water that is only marginally better than tap water. Upgrading to a new system with a remineralization stage provides both better filtration and better taste.
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