Geotextile Dewatering

CRS Envitube® geotextile dewatering containers provide a unique solution to dewatering fine-grained material, sludges and slurries. With the in-line addition of a suitable polymer, solids pumped into the Envitube® combine and release water through the pores of the Envitube® container. 

Due to the surface tension exhibited by full CRS Envitube® containers, rain cannot permeate the geotextile weave, allowing the contained solids to become progressively drier whilst remaining fully contained. 

All that's required to establish CRS Envitubes® is a lined, level bunded area which acts to contain the filtrate from the Envitubes® that is then returned to the respective dam, lagoon or process at our client's discretion.

Services > Geotextile Dewatering

CRS Envitube®

How does it work?

Dewatering via CRS Envitube® typically involves the following steps:

1. Civil Establishment 

2. Bag Layout 

3. Initial Pumping 

4. Dewatering 

5. Consolidation & Removal

Ballina Boat Harbour - Liner Installatio

1. Civil Establishment

The nominated dewatering area should be level and have bund walls created to encase the area. An impervious liner is then installed, in addition to the creation of a spillway or a sump to assist with filtrate return.

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2. Envitube® Layout

CRS Envitube® geotextile dewatering containers are laid out on the prepared dewatering area. Where multiple Envitubes are required each tube is manifolded from the central dredge delivery line and able to be isolated via individual valves.


3. Pumping

The dredged sludge will be pumped to the dewatering area and flocculated in line with a mid-high strength cationic polymer prior to entry into the CRS Envitube®.

Centennial Coal - Mannering Colliery - F

4. Dewatering

The clear filtrate percolates through the pores in the woven geotextile material and makes its way back to the nominated filtrate return point.

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5. Consolidation & Removal

At the end of filling cycles, CRS Envitubes® are taken offline for final dewatering and consolidation. Once a target solids content has been reached within the tubes material can then be excavated and transported offsite for beneficial reuse or to landfill.


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