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Calcite Neutralization Filters Information

 Is there a method of raising the feedwater pH without adding a chemical to the system?

Use of Calcite cartridge or media filter will raise the ph of water. This is done routinely in such situations.

Where is Calcite used?

Adding calcite to water gives water alkalinity which offsets the acidity (low pH) of water caused by dissolved carbon dioxide.

Where does the carbon dioxide come from?

Carbon dioxide in small amounts is present in all natural waters. In reverse osmosis membranes remove the alkalinity present in water but not the carbon dioxide, because it is a gas. This creates a low pH in the product water.

How much calcite is required to neutralize the water?

Each 100 mg/l of Calcite will neutralize 44 mg/l of carbon dioxide. So I cubic foot (about 100lbs) of Calcite will treat about 96,800,000 mg of carbon dioxide. If water has 20 mg/l of carbon dioxide then 1 cubic foot will treat: (96,800,000 / 20) liters of water. Or 4,840,000 liters or 1,278,730 gallons of water. If the water usage is 10,000 gallons/day, then 1 cubic foot of Calcite will last 128 days.

How long will 1 cubic foot of Calcite last?

Follow these steps:

a. Multiply the liters of water used by amount of carbon dioxide in mg/l. Let us call this number X.
b. Divide 96,800,000 by X. This will give you the number of days 1 cubic foot of Calcite will last.


How do calcite filters work?

Upon contact with calcite, acidic waters slowly dissolve the calcium carbonate to raise the pH which reduces potential leaching of copper, lead and other metals found in typical plumbing systems.

What is Calcite?

Calcite is a crushed and screened white marble media which can inexpensively be used to neutralize acidic or low pH waters to a neutral, less corrosive effluent.  Calcite is a naturally occurring calcium carbonate media

What are the specifications for the AMI W-N3072 Calcite Filter?

  • Effective media size is 0.4mm
  • Uniformity coefficient is 1.5
  • Head loss through the media (only) is approximately 0.35psi for a 30 bed at 60° F water temperature and 5 gpm/ft2
  • Typical service loading rates are approximately 3-6 gpm/ft2 or as applicable to the specific application
  • Media replacement depends upon water being treated (low pH water) but is typically in the range of 3-6 months, approximately
  • Backwash water from the feed (clean) is common for this type of system.


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    All Content on this site is  intended for informational purposes for experienced water treatment professionals only.  Applied Membranes, Inc. does not assume any liability for any damages caused by the misapplication or misinterpretation of any of the information contained on this website.
    Applied Membranes, Inc. 2007