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Acidic well water is treated with a calcite filter or, for very low pH or high flow, a soda ash feed pump.
For the full breakdown, see our best Acid Neutralizer for Well Water guide.
Blue-green stains around the drains are often the first warning that well water is acidic enough to corrode copper pipes. You choose how to treat acidic well water by checking two numbers first: pH and flow rate — and most homes end up with one of two systems.
Two Ways To Treat Acidic Well Water
Two home treatment methods dominate, and the Water Systems Council lists both: acid neutralizing filters and chemical feed pumps that inject a neutralizing solution.
Acid left untreated is corrosive. Connecticut Department of Public Health guidance warns that acidic water can damage plumbing, pressure tanks, water heaters, and fixtures — so treatment protects the whole house, not just the tap.
Which Treatment Fits Your pH?
| Water pH | Treatment That Works | What To Know |
|---|---|---|
| 6.0–6.9 | Calcite neutralizing filter | Standard for mildly acidic well water; backwash periodically and refill about once a year. |
| 5.0–5.9 | Calcite + magnesium oxide blend | Stronger media for water more acidic than calcite alone can fix. |
| Below 5.0 | Soda ash chemical feed pump | For very acidic or high-flow wells; monitor feed rate and treated pH. |
| Any acidic pH plus grit | Add a pre-filter strainer | Sediment
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