Dong-A Geovan Co., Ltd.

Casagrande-type filter used in geotechnical or soil testing applications....

Hygiene & Cleaning Systems Dong-A Geovan Co., Ltd. 19 Apr 2026 ( )

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Simple and economic measurement of groundwater pressures in soil and rock can be carried out using Casagrande type piezometers. Typical application include:

Monitoring of dams, reservoirs & embankments
Slope stability
Groundwater levels for dewatering & drainage
Groundwater sampling
Permeability testing
Contaminated soil monitoring

Geovan Porous Filter Tip is made up of low air entry porous plastic elements which are connected to standpipe tubing and lowered into a predrilled borehole. Alternative types may be driven or pushed into soft soil.

Where Casagrande type piezometers are being installed then the porous element is surrounded by filter sand and a Bentonite seal placed above this response zone.

Water level measurements are normally taken using a water level meter or in the case of artesian pressure a Bourdon pressure gauge is attached to the top.

Material	HDPE
Mean pore size	50 microns
Permeability	3 x 10-4m/s
Porosity	35%

Diameter(mm)	Length(mm)
OD 30	400
OD38	400
OD 48	400

(Other size on request)

Technical Specifications

Item	Specifications	Remarks
Update Date	Dong-A Geovan Co., Ltd.	2026
Lead time	within 30 days	Can be expedited
Material	See product manual	Request Inspection Report
Application	Applicable to multiple industries	Complies with standards
Keywords	Casagrande,Filter,Simple,economic,measurement,groundwater

Procurement suggestions

Refers to a porous stone or ceramic filter used in geotechnical laboratory testing (e.g., Casagrande liquid limit apparatus) to allow water drainage while retaining fine soil particles. Must meet ASTM D4318 standards for porosity and dimensional stability under load. Not to be confused with industrial fluid filters. (for reference only)