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Construction Dewatering

with Silt Bags and Flocculants

Ground water accumulates on a construction site as a result of excavating, land moving and concrete cutting. Dewatering removes the collected water with pumps while silt bags and flocculants separate suspended solids from the water. Use silt bags and flocculants on their own or combine them for maximum efficiency.

Dewatering Bag pumped full of silt and water

Dewatering Bags

Use a dewatering bag to pump silty water out of overly saturated construction sites. A dewatering bag is also known as a Silt Bag and a Pump Bag.

5′ x 6′
12′ x 12′
15′ x 15′
15′ x 30′
30′ x 30′
Inquire about custom sizes for special applications.

To dewater your site, connect a pump hose to the dewatering bag. For best results, place the silt bag on a clean stone base or pervious surface. This will allow for filtered water to be released from all sides of the dewatering bag.

Once the pump is started, the dewatering bag will fill with water, sediment, sand and debris. As the bag starts to fill, the sediment will settle and filtered water will discharge.

Monitor the pump speed and the bag’s sediment levels daily. Once the bag has reached capacity, replace the silt bag with a new one.

CSB Series Silt Bag Specification


Use flocculants for construction dewatering to improve the sedimentation process. When properly administered, flocculants increase settling rates and remove contaminants like heavy metals and other pollutants. During the flocculation process, a flocculant binds to the contaminants in a body of water to improve the quality of the discharged water.

The Dirt Pill is a water-soluble tablet that improves the efficiency of construction dewatering.

Insert the tablet into a silt bag to flocculate sediment. When the Dirt Pill bonds to the sediment, the material coagulates and forms a mass. As a result, sediment is retained and filter water is discharged.

Dirt Pill Specification

The Floc Bag is a bagged flocculant that improves construction dewatering. Use the Floc Bag in ditch channels, retention ponds and sediment basins. The bag design ensures proper dosing at a controlled rate.

Before installing the Floc Bag, remove the plastic covering.

Tie the Floc Bag to a post in the ditch, pond or basin to begin sedimentation process.

Each bag has a loop hanger incorporated into its netting to ensure easy installation. Floc Bags can also be attached to wattles, silt fence and sediment retention rolls.

Bags Per CasePallet Quantity
8 Bags/Case36 Cases/Pallet
Each bag weighs approximately 4 pounds
Floc Bag Specification
Product Label
Safety Data Sheet

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