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What is the Difference Between Sand Filter and Multimedia Filter?

Sand Filter

Shallow sand filters and multi-media filters are two commonly used filtering devices in water treatment. They have significant differences in structure, filter material composition, filtering principle and usage scenarios. The following are the main differences between the two.

Shallow sand filter
1. Filter material composition.
  • Shallow sand filters usually use a single filter material, such as quartz sand, with uniform particle size.
  • Multi-media filters use filter materials of various materials and particle sizes, such as anthracite, quartz sand, magnetite, etc., which are laid in layers according to density and particle size, with coarse particles on the upper layer and fine particles on the lower layer.
2. Filtration principle.
  • Shallow sand filters are mainly surface filtration, and suspended matter is trapped on the surface of the filter bed. The filtration accuracy is low and it is suitable for removing larger particles.
  • Multi-media filters achieve step-by-step interception through deep filtration. The coarse filter layer removes large particles, and the fine filter layer removes small particles and colloids, with higher filtration accuracy.
3. Structural and operating characteristics.
  • Shallow sand filters have a simple structure, small size, and often adopt modular design, which occupies less space.
  • The multi-media filter has a complex structure, a large tank, and a deep filter layer.
4. Application scenarios.
  • Shallow sand filters are suitable for low turbidity water pretreatment, such as circulating cooling water, swimming pool water, and small water supply systems, suitable for occasions with limited space.
  • Multi-media filters are used for high turbidity water or complex water quality treatment, such as surface water purification, industrial wastewater pretreatment, and reverse osmosis system pre-protection. They are suitable for scenarios with high requirements for effluent water quality and deep filtration.
Shallow sand filter

Depending on the specific water quality, treatment objectives, and operating conditions, the two can also be used in combination. For example, first use a multi-media filter for coarse filtration, and then use a shallow sand filter to further optimize the water quality.

Shallow sand filter

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Nina

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