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On private water systems, one of the most common causes of corrosion is low pH (< 7.0) waters. Treatment is accomplished by neutralizing the water - passing acidic water through granular calcium carbonate is the most common method utilized.
Many forms of calcite media are available on the market. However, not all are safe for use in drinking water. Our unit uses Imerys’ calcium carbonate (calcite) that have been tested and certified by NSF International to NSF/ANSI Standard #60.
Imerys' NSF Certified Calcium Carbonate media, also known as calcite, is prepared from naturally occurring, high-quality marble. Common uses for calcite include: pH adjustment, corrosion control, and remineralization of desalinated water.
Calcite is a naturally occurring calcium carbonate media. One of the advantages of Calcite is its self-limiting property. When properly applied, it corrects pH only enough to reach a non-corrosive equilibrium. It does not overcorrect under normal conditions. Upon contact with Calcite, acidic waters slowly dissolve the calcium carbonate to raise the pH which reduces the potential leaching of copper, lead and other metals found in typical plumbing systems. Periodic backwashing will prevent packing, reclassify the bed and maintain high service rates. Depending on pH, water chemistry and service flow, the Calcite bed will have to be periodically replenished as the Calcite is depleted.
As the Calcite’s calcium carbonate neutralizes the water, it will increase hardness and a softener may become necessary after the neutralizing filter. Calcite can be effectively combined with Clack Corosex to combine the high flow neutralization properties of Corosex, along with the slower reacting low flow properties of Calcite, increasing the ability to correct low pH.
|Model||Calcite 25kg Bag|
Calcite 25kg Bag - 15 Litres|
• Naturally occurring material
• Low uniformity coefficient for maximum contact for controlled pH correction
• Slower reacting for controlled pH correction
• Color: Near white
• Bulk Density: 90 lbs./cu. ft.
• Mesh Size: 16 x 40
• Specific Gravity: 2.7
• Effective Size: 0.4 mm
• Uniformity Coefficient: 1.5
• Hardness: 3.0 (Mohs scale)
• Composition: CaCO3, 95% min. MgCO3, 3.0% max.
CONDITIONS FOR OPERATION
• A gravel support bed is recommended
• Water pH range: 5.0-7.0
• Bed depth: 24-30 in.
• Freeboard: 50% of bed depth (min.)
• Backwash rate: 8-12 gpm/sq. ft.
• Backwash Bed Expansion: 35% of bed depth
• Service flow rate: 3-6 gpm/sq. ft. but may be modified to adapt to local conditions
Certified to ANSI/NSF Standard 60