For optimum performance, drip irrigation system must be provided with clean water. An adequate filtration process is an absolute requirement because rarely is a natural water supply free of suspended material; filtration is the heart of every successful drip Tape system.

In general, sand media filters provide the most efficient means of removing contaminants particularly for surface water sources where high concentrations of organic and inorganic materials may be found. Many systems will have backup screen filters located downstream of media filters to provide insurance and prevent any media from entering the system.

How works a media filter.

Sand filter in operation.

Sand filter: filtration process.

Sand filter: backwashing process (right tank).

Water pass through the inlet collector;
Filtered water  is collected at the outlet collector

Open the inlet valves (Va1 and Vb1);
close the 2 backwash valves (Va2 and Vb2).
Clear water pass through the main outlet .

Close the inlet valve Vb1 and the backwah valve Va2;
open the inlet valve Va1 and the backwash valve Vb2;
The debris are flushed through the backwash outlet Vb2.

Specs

Value (metric / US)

• Always install an air vent at the highest point of the filter.

• Use 2 pressure gauges to control pressure loss into the filter.