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Acidity (low pH)


In well water, one of the most common causes of corrosion is acidic or 'aggressive' water. Water that has a pH value of less than 7.0 is considered to be 'acidic', while water above a 7.0 pH is considered to be 'basic'.

To better understand the range in pH, take a look at these examples:

·         Apple Juice - 3

·         Orange Juice - 3.5

·         Coffee - 5.5

·         Milk - 6.2

·         Baking Soda - 8.5

·         Soapy water - 10

·         Bleach - 12


Signs of acidic water include corrosion of fixtures, pinhole leaks in plumbing, and staining (blue/green from copper pipes) or red (from iron pipes).

The EPA recommends pH levels should be within 6.5 -8.5

Without treatment, acidic waters will dissolve copper, lead and other metals from piping, fixtures and appliances.



Water with low pH levels are typically treated either by passing the water through a bed of chemically reactive media such as a calcite tank or via feeding a liquid chemical such as a solution of soda ash.  Keep in mind the addition of elements as a result of treatment may cause the water to hard, which may require additional treatment such as water softening.  High level pH is commonly treated using a chemical feed of a weak acid solution.

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