Research on Progressive Stabilization Filter System of Silt Foundation around Tube Well

Table 3

Silty sand loss percentage after filtration.

Serial number	Filter material	0–2 cm from the interface (%)	2–4 cm from the interface (%)
1	U.S. water and soil conservation agency filter media	1.1	0.5
2	Terzaghi upper covered wire filter material	1.25	0.7
3	Terzaghi undercover filter material	3.62	1.45
4	Water Research Institute filter material	4.65	2.2
5	Witt filter	5.78	2.6
6	Outsourcing coarse particle filter	12.4	6.1