Membranes
Clack Calcite Filter Media for pH
Clack Calcite A8021-01 filter media supports acidic-water pH correction. Select by pH, alkalinity, hardness, flow, vessel, bed depth, backwash, and target.
Clack Calcite filter media for acidic-water pH correction
Clack Calcite A8021-01 is calcium-carbonate filter media for gradually raising acidic-water pH under suitable design conditions. PT Watermart Perkasa supplies it in Indonesia; selection follows pH, alkalinity, hardness, flow, vessel size, bed depth, backwash, and the treated-water target.
Updated 29 July 2026: Calcite selection criteria, design requirements, and project procurement data were clarified.
| Measured condition | Medium to consider | Design check |
|---|---|---|
| Acidic water needing gradual correction | Clack Calcite | Inlet pH, alkalinity, dissolution rate, and added hardness |
| Dissolved iron or manganese | Clack Birm | pH, dissolved oxygen/oxidation, interfering substances, and backwash |
| Very acidic water or a faster response | Clack Corosex | Overcorrection risk, hardness, flow, and cementation tendency |
Calcite, Birm, and Corosex are not interchangeable. Calcite provides gradual pH correction, Birm serves iron or manganese duty under suitable water conditions, and Corosex is a more reactive pH-correction medium. For iron or manganese problems, compare iron and manganese filter media using the water analysis, oxidation method, and backwash capacity.
When should Calcite media be selected for pH correction?
Consider Calcite when low pH is the main problem and gradual correction is preferable to a highly reactive medium. The Clack Calcite data sheet, reviewed 29 July 2026, explains that this calcium-carbonate medium dissolves slowly in acidic water, can add hardness, and requires periodic replenishment.
Do not select from inlet pH alone. Alkalinity, hardness, service flow, contact time, bed volume, freeboard, backwash capacity, and the outlet-pH target determine whether Calcite, Corosex, a designed blend, or another process is appropriate. Use the data-sheet revision current at procurement and require the quotation to state its design assumptions.
| Initial check | Information to confirm |
|---|---|
| Water problem | pH, alkalinity, hardness, TDS, iron, manganese, and the corrosion concern being evaluated |
| Process target | Outlet pH and hardness target, normal/peak flow, and operating hours |
| Filter | Internal vessel diameter, bed depth, support bed, freeboard, control valve, backwash, and drain |
| Procurement | Clack A8021-01, data-sheet revision, bag count, destination, timing, documents, and work boundary |
The data sheet also states that this filter media does not remove or kill bacteria. Drinking-water applications still require adequate disinfection, commissioning, sanitation, consumables records, representative sampling, and laboratory verification against applicable Indonesian requirements.
What determines the Clack Calcite media price?
| Quotation factor | Information to provide |
|---|---|
| Product and packing | Clack Calcite A8021-01, bag weight or volume, bag quantity, and project documents |
| Water quality | Inlet pH, alkalinity, hardness, TDS, iron, manganese, and the target pH after filtration |
| Filter capacity | Normal/peak flow, operating hours, vessel diameter, design bed depth, and freeboard |
| Backwash | Available flow, pressure, duration, drain capacity, and control-valve limit |
| Supply scope | Media only or removal, loading, commissioning, sampling, and delivery |
Compare Calcite quotations using the same product code, pack weight or volume, design media quantity, delivery, and work scope. Calcite dissolves gradually and can add hardness, so monitor treated pH, media consumption, and filter-outlet water quality. Consider Corosex or a blend for faster correction only after the design and water target are reviewed.
How is the required number of Clack Calcite bags estimated?
Estimate Clack Calcite bags from the design bed volume, not the vessel’s total volume. The Calcite data referenced on this page lists A8021-01 in 0.55 cu. ft. or 50-lb bags and a 24–30-inch bed depth. Multiply the vessel’s internal cross-sectional area by the selected bed depth using consistent units, then convert that volume to a bag count.
| Calculation input | Check before ordering |
|---|---|
| Vessel internal diameter | Use the internal diameter, not the nominal or outside tank dimension |
| Design bed depth | Match the data sheet, flow, and pH-correction duty rather than filling the vessel completely |
| Number of units | Calculate each vessel so media distribution can be checked |
| Support bed and freeboard | Do not count gravel or backwash-expansion space as Calcite volume |
| Work allowance | State whether the quotation includes handling loss or only the design volume |
Volume calculation supports procurement; it does not prove the target pH will be reached. Inlet pH and alkalinity, contact time, service flow, media consumption, added hardness, and backwash capacity must still be checked before quantity and price are finalized.
What determines the Clack Corosex price?
| Quotation factor | Why it is needed |
|---|---|
| Media quantity and packing | Establishes the purchase quantity and material handling |
| pH, alkalinity, hardness, and TDS | Helps assess whether Corosex, Calcite, or a blend is more suitable |
| Normal and peak flow | Affects vessel diameter, contact time, and service flow |
| Vessel, valve, freeboard, and backwash | Confirms that the media can expand and backwash as designed |
| Project location and required date | Used to check delivery, availability, and lead time |
Send these data through the Watermart contact form. The quotation should identify product, quantity, packing, and supply scope; media price does not include the vessel, valve, installation, commissioning, or testing unless stated in writing.
Table of Contents
- Clack Birm®: Iron & Manganese Removal Media
- Clack Calcite: Calcium Carbonate Based pH Correction Media
- Clack Corosex: Magnesium Oxide Media for Rapid pH Correction
- Applications and System Integration
- Ordering Information & Technical Support
- Download PDF Datasheet
Clack filter-media FAQ
Is the Calcite price per bag enough to compare quotations?
No. Compare the product code, volume and weight per bag, design media quantity, documents, delivery, and included work. A media-only offer is not equivalent to a package covering removal, loading, commissioning, sampling, or old-media handling.
What is the difference between Corosex and Calcite?
Corosex is magnesium oxide and reacts more rapidly, while Calcite is calcium carbonate with a more gradual response. The medium or blend depends on pH, alkalinity, hardness, flow, contact time, and backwash capacity.
Can Corosex be installed after RO?
Corosex may be considered for remineralisation or pH correction after RO, but media dose, contact time, resulting pH, and dissolved minerals must be tested. A higher pH alone does not establish that water is ready to drink.
What data is needed to select the medium?
Send pH, alkalinity, hardness, iron, manganese, TDS, normal and peak flow, vessel size, valve details, and the treated-water target through the Watermart contact form.
Clack Birm®: Granular Filtration Media for Iron and Manganese Removal
Clack Birm® is granular filter media for removing dissolved iron and manganese from water supplies under conditions that meet the product data. It acts as an oxidation catalyst without chemical regeneration, but still requires suitable pH, dissolved oxygen, service flow, and backwash.
Advantages of Clack Birm®
- No Chemical Regeneration Required: Birm® works as a catalyst, thus reducing operational and maintenance costs.
- High Efficiency: Able to effectively remove iron and manganese at suitable water conditions.
- Long Durability: Long lasting media with low attrition loss, extending media replacement intervals.
- Easy Maintenance: Requires only periodic backwash, reducing labor requirements and maintenance costs.
- Stable Performance: Operates well over a wide temperature range.
Physical & Chemical Specifications of Clack Birm®
| Property | Value |
|---|---|
| Model Number | A8006 |
| Color | Black |
| Bulk Density | 35-40 lbs/cu. ft. |
| Mesh Size | 10 x 40 |
| Specific Gravity | 2.0 gm/cc |
| Effective Size | 0.48 mm |
| Uniformity Coefficient | 2.7 |
| Weight | 35-40 lbs/cu. ft. |
Operating Conditions
| Parameter | Requirement |
|---|---|
| Alkalinity | >2× combined sulfate & chloride concentration |
| Max Water Temp | 100°F (38°C) |
| pH Range (Iron Removal) | 6.8 - 9.0 |
| pH Range (Manganese Removal) | 8.0 - 9.0 (best results), below 8.5 not recommended |
| Dissolved Oxygen (D.O.) Content | ≥15% of iron content (iron + manganese) at min. 0.5 ppm |
| Bed Depth | 30-36 in. |
| Freeboard | 50% of bed depth (min.) |
| Backwash Rate | 10-12 gpm/sq. ft. |
| Backwash Expansion | 20-40% of bed depth (min.) |
| Service Flow Rate | 3.5-5 gpm/sq. ft. (intermittent or local conditions may allow more) |
Inlet & Backwash Water Quality Limitations
- Free chlorine: <0.5 ppm
- Hydrogen sulfide: Not recommended
- Oil or polyphosphates: Must not be present
- Avoid chemicals that may coat or damage Birm®
Clack Birm® Application
- Municipal water treatment plants
- Industrial process water conditioning
- Commercial drinking water filtration
- Gravity-flow and pressurized filtration systems
- Pretreatment for RO and softener systems
Installation Requirements
- Water alkalinity must be sufficient to support precipitation.
- Dissolved Oxygen of at least 15% of total iron/manganese content.
- System must be capable of backwash at an appropriate rate and bed expansion.
- Avoid use in water with high chlorine, oil, hydrogen sulfide, or polyphosphates.
Clack Birm® Ordering Information
| Part No. | Description | Cu. Ft/Bag | Wt./Cu. Ft. | Bags/Pallet | Weight/Pallet | Pallet Dimensions |
|---|---|---|---|---|---|---|
| A8006 | Birm® | 1 | 35-40 lbs. | 40 | 1450-1650 lbs. | 40” × 48” × 42” |
Conclusion: Consider Clack Birm® A8006 for iron and manganese only when pH, dissolved oxygen, interfering substances, service flow, and backwash meet the datasheet limits. Confirm availability with PT Watermart Perkasa at quotation.
Clack Calcite: Calcium Carbonate Filtration Media for pH Correction
Clack Calcite is a natural calcium carbonate (white marble) based filtration media used to neutralize acidic (low pH) water and prevent corrosion in water distribution systems. This product is suitable for potable, industrial, and municipal water treatment applications that require pH stabilization with low operational costs.
Clack Calcite Advantages
- Gradual Response: Calcite dissolution helps limit the correction rate, but the resulting pH must still be tested.
- Composition and Certification: The datasheet lists >95% CaCO₃ and NSF/ANSI 60; media certification does not replace treated-water verification.
- Prevents Corrosion: Reduces dissolution of metals such as copper and lead.
- Economical: Long media replacement intervals and low maintenance costs.
- Can be Combined: Can be mixed with Clack Corosex for greater pH correction.
Clack Calcite Technical Specifications
| Property | Value |
|---|---|
| Color | Near white |
| Composition | CaCO₃ > 95%, MgCO₃ < 3% |
| 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 (Mohs scale) | 3.0 |
| Bed Depth | 24-30 in. |
| Recommended pH Range | 5.0 - 7.0 |
| Freeboard | 50% of bed depth (min.) |
| Backwash Rate | 8-12 gpm/sq.ft. |
| Service Flow Rate | 3-6 gpm/sq.ft. |
| Max. Usage Level | 650 mg/L |
| Certification | NSF/ANSI 60 |
Clack Calcite Order Information
| Part No. | Description | Cu. Ft./Bag | Wt./Cu. Ft. | Bags/Pallet | Weight/Pallet | Pallet Dimensions |
|---|---|---|---|---|---|---|
| A8021-01 | Calcite | 0.55 (50-lbs) | 90 lbs | 50 | 2550 lbs | 48” × 36” × 40” |
Calcite Clack Application
- Domestic, commercial, and municipal water treatment systems for pH neutralization
- Industrial process water requiring corrosion control
- Point-of-entry (POE) and point-of-use (POU) for drinking water
Installation Requirements
- Use gravel support bed for optimal distribution.
- Bed depth 24-30 inches, freeboard at least 50% of bed depth.
- Backwash rate 8-12 gpm/sq.ft. with 35% bed expansion.
- Service flow rate 3-6 gpm/sq.ft. as required.
Conclusion: Clack Calcite can correct acidic-water pH when bed depth, flow, backwash, and source-water quality match the datasheet. Treated-water quality and product availability must still be confirmed.
Clack Corosex: Magnesium Oxide Media for Rapid pH Correction
Clack Corosex® is a magnesium oxide (MgO) based hard bead-like filtration media designed to neutralize acidic water quickly and efficiently. It is suitable for applications with large pH correction requirements or high flow rates, such as in municipal, industrial, and well water treatment.
Advantages of Clack Corosex®
- Fast Neutralization: Highly reactive, ideal for pH correction of highly acidic water.
- High Efficiency: Low media consumption, reducing replacement frequency and maintenance costs.
- Durable Structure: Bead-like shape reduces cementation and facilitates backwash.
- Media Certification: The datasheet lists NSF/ANSI 60; a drinking-water system still requires commissioning and treated-water verification.
- Can be Combined: It can be blended with Clack Calcite when the media ratio and resulting pH are established by design and testing.
Clack Corosex® Physical Specifications
| Property | Value |
|---|---|
| Color | Brownish white |
| Bulk Density | 75 lbs/cu.ft. |
| Mesh Size | 6 x 16 |
| Specific Gravity | 3.6 gm/cc |
| Effective Size | 1.4 mm |
| Uniformity Coefficient | 1.7 |
| Composition | Minimum 97% MgO |
| Maximum Usage | 100 mg/L |
Operating Conditions
| Parameter | Value/Range |
|---|---|
| Water pH Range | 4.5-6.0 |
| Bed Depth | 24-30 in. |
| Freeboard (Minimum) | 50% of bed depth |
| Backwash Rate | 10-12 gpm/sq.ft. |
| Service Flow Rate | 5-6 gpm/sq.ft.* |
| Hardness Limit for Downflow | < 5 grains/gal |
| Hardness Limit for Upflow | > 5 grains/gal (recommended) |
| Max Flow pH Correction | Up to 5 units |
| Max Usage | 100 mg/L |
| Backwash Frequency | As required |
Ordering Information for Clack Corosex®
| Part No. | Description | Cu. Ft./Bag | Wt./Cu. Ft. | Bags/Pallet | Weight/Pallet | Pallet Dimensions |
|---|---|---|---|---|---|---|
| A8011 | Corosex® | 0.66 (50 lbs.) | 75 lbs. | 60 | 3050 lbs. | 48” x 36” x 50” |
Corosex® Clack Application
- Municipal water treatment for corrosive water sources
- Industrial process water neutralization
- Well water treatment for households and rural facilities
- Post-treatment after reverse osmosis or demineralization
- Corrosion prevention of distribution pipes and equipment
Installation Requirements
- Use downflow service for hardness < 5 grains/gal.
- Use upflow service if hardness > 5 grains/gal to prevent cementation.
- Install in-line filter before upflow system.
- Use a special distributor for upflow applications.
- Recommended gravel support bed and regular backwash.
Conclusion: Consider Clack Corosex® for acidic-water pH correction after checking hardness, flow configuration, service rate, and cementation risk. Confirm the model and availability at quotation.
Clack Media System Application and Integration
Clack Birm®, Calcite, and Corosex media can be used individually or combined for a more comprehensive water treatment solution. For example, Clack Calcite and Clack Corosex are often used together for pH correction of highly acidic water, while Clack Birm® is particularly effective as a pre-treatment before reverse osmosis or softener systems.
- Municipal and commercial drinking water treatment
- Industrial process water treatment (boiler feed, cooling tower, etc.)
- Treatment of well water and natural water sources
- Protection of distribution systems from corrosion and iron/manganese deposits
PT Watermart Perkasa supports the needs of system design, technical consultation, and procurement of water filtration media with reliable after-sales service.
Ordering Information & Technical Support
PT Watermart Perkasa supplies Clack Birm®, Clack Calcite, and Clack Corosex in Indonesia. Availability, product revision, and lead time are confirmed at quotation.
Contact us via WhatsApp, email, or the website form for technical consultation, a quotation, or more information about Clack water filtration media.
Download PDF Datasheet
Why Choose PT Watermart Perkasa?
- Availability of Clack Birm®, Calcite, and Corosex is checked at quotation
- Professional technical support for water filtration system design and troubleshooting
- Fast delivery and reliable after-sales service
Contact PT Watermart Perkasa with water-test, flow, and vessel data for a media review.