Ph Filters FAQ- How do they work and what do they do?
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pH filters FAQ
ph filters - Calcite is 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. 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 over correct 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 back washing 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.
Advantages of using an ph filter
- Naturally occurring material
- Low uniformity coefficient for maximum contact for controlled pH correction
- Slower reacting to 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
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.