Ceramic Filter Ball (Support & Distribution Media)
Ceramic balls are high-alumina (Al₂O₃ 17-23% standard; 75%+ high-alumina) sintered ceramic spheres used as support and distribution media beneath filtration beds. Placed in graded layers (large balls bottom, small top) above the underdrain, they prevent fine media migration into laterals, distribute backwash water evenly, and provide structural support for the bed above. Available in 3 mm to 50 mm diameters. Standard for GAC, anthracite, sand, and multi-media filter constructions.
Technical Specifications
| appearance | White to off-white smooth spheres |
| bulk density | 1.2-2.5 g/cm³ (Al₂O₃-dependent) |
| Al2O3 content | 17-23 wt% (standard); ≥ 75 wt% (high-alumina); ≥ 92 wt% (alumina ceramic) |
| diameter range | 3, 6, 8, 10, 13, 16, 20, 25, 38, 50 mm (graded) |
| acid resistance | ≥ 98 wt% (1 h, 20% HCl) |
| water absorption | ≤ 0.5 wt% (≤ 0.3% for high-alumina) |
| alkali resistance | ≥ 98 wt% (1 h, 20% NaOH) |
| compressive strength | ≥ 80 N/grain (10 mm); ≥ 300 N/grain (25 mm) |
Applications
- Support media beneath GAC, anthracite, sand, manganese sand, and zeolite filter beds
- Catalyst bed support in fixed-bed reactors and tower packing
- Heat exchanger media and regenerative thermal oxidizers (RTO)
- Drying tower and adsorber bottom support
- Distillation column packed bed support
- Inert ball layer below ion-exchange resin in IX columns
Key Features
- Graded ball diameter prevents finer media from migrating into underdrain laterals
- Inert across full pH range and operating temperatures (-30 to 1500 °C for high-alumina)
- Smooth spherical surface provides low pressure drop and even backwash flow distribution
- 20+ year service life with no chemical degradation
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