Hy-Tex Ultra Dewatering Bags provide an effective way to collect harmful sediments from dirty water pumped out of excavation works (such as foundations, pipe line construction, sewer and utility trenches, waterways and lakes) that would otherwise pollute the surrounding environment.

It is a legal requirement to prevent silty water from leaving site untreated, and a finable offence if you do not take appropriate pollution control measures. The Environment Agency Pollution Prevention Guidelines PPG6, in summary, require that the majority of suspended solids (gravel, sand, and silt) must be removed from site water before it is discharged into a drain, sewer or watercourse.

The standard 1.80 x 1.80m Ultra Dewatering bags has the capacity to trap near 1 tonne of silt and cope with flow rates up to 2,730 l/min, while the larger 3.05 x 4.55m bags can trap over 4 tonnes of silt and cope with flow rates up to 6,818 l/min.

Kindly note, if a smaller bag is required, we also offer our biodegradable 0.90 x 1.20m (approx 3 x 4ft) Biobrane™ Dewatering Bags.

Features/Benefits:

  • Collects harmful sediment before it can enter the watercourse

  • Cost effective solution

  • Multiple sizes to cater for all needs

  • Light, compact and easy to store

  • Only requires a small working area

  • 180 micron pore size

Guidance

  • 1.8 x 1.8m (6 x 6ft) bags are designed for a 4 to 6* inch pump's maximum flow rate

  • 3.05 x 4.55m (10 x 15ft) bags are designed for a 6 inch pump's maximum flow rate

*Adjust pump size and flow rate accordingly to sediment you are filtering

Size

Code

Surface Area

Max Flow Rate

Max Pump Size

Sediment Capacity

Oil Capacity

1.80 x 1.80 m(6 x 6 ft)

9724

6.48 m²(72 ft²)

1,890 l/min(500 gal/min)

15 cm(6 inch)

0.51 m³ / 980 kg(18 ft³ / 2,160 lbs)

14 l(3.7 gal)

3.05 x 4.55 m(10 x 15 ft)

9725

27.87 m²(300 ft²)

5,670 l/min(1,500 gal/min)

15 cm(6 inch)

4.20 m³ / 8,165 kg(150 ft³ / 18,000 lbs)

57 l(15.1 gal)

*Adjust pump size and flow rate accordingly to sediment you are filtering

Property

ASTM Test

Value

Material

Non-woven polypropylene geotextile

Grab Tensile Strength

D 4632

912 N (205 lb)

Elongation

D 4632

50%

Trapezoid Tear

D 4533

356 N (80 lb)

Puncture Resistance

D 4833

2,335N (525 lbs)

Mullen Burst

D 3786

2,896 kpa (420 psi)

Permittivity

D 4491

1.5 sec-¹

Pore Size O90

180 micron

UV Stability

D 4355

70% strength retained after 500hr

Weight

D 5261

272 g/m² (8 oz/yd²)

Flow Rate

D 4491

3,660 l/min/m² (90 gal/min/ft²)