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Removes large solids before finer filtration.
Bar screens / strainers
Drum filters
Sand traps / grit removal
Removes suspended solids (turbidity).
| Technology | Details | Typical Use |
|---|---|---|
| Multimedia / sand filters | Gravel → sand → anthracite beds | Cooling towers, pretreatment |
| Bag / cartridge filters | Disposable filter elements | Fine sediment polishing |
| Automatic backwash filters | Self-cleaning | Continuous operation systems |