The several factors affect ...

The several factors affect the dimensioning of the sand filtration:

- raw water source (groundwater, river, lake etc.)

- raw water quality (turbidity, Fe, Mn, etc)

- the overall treatment process and process units before sand filtration (like is there a clarification process)

- the process units after sand filtration (like GAC filter)

- do you have just sand , or you could use sand/antracite filters

In general you could use filter bed depth of app 1m and effective sand diameter of 0.8mm , with uniformity size of <1.4. Try to maintain L/d>1200