Gravity Sand Filter
  1. OverFlow
  2. Filter Influent
  3. Coarse Media
  4. Fine Media
  5. Filtrate Nozzles
  6. Filtrate Chamber
  7. Level Controller
  8. Filter Reject
  9. Washbox
  10. Counter-Current Washer
  11. Airlift
  12. Central Feed Chamber
  13. Actuated Valve
    14.

Application Loading Rate (gpm /ft2) Influent Solids (TSS mg / L) Filtrate (TSS mg / L)
Tertiary Filtration 3 to 11 20 to 150 1 to 10
Algae Removal 3 to 4 20 to 150 1 to 10
Surface Water Direct Filtration 3 to 8 10 to 200 NTU < 1 NTU
Metal Hydroxides 3 to 7 20 to 100 1 to 5
Phosphorus Removal 3 to 7 20 to 100 1 to 3 (TSS), < 0.3 P