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SPEL HydroChannel

Tertiary Stormwater Filtration Treatment in Grated Drains

grated drains stormwater filtration treatment

Decentralized stormwater treatment is becoming more and more interesting for authorities and planners. It is seen as an important measure within the implementation of the WSUD as it can be deployed very precisely, and therefore cost effectively.

View the drawings here: Technical Drawings

The SPEL HydroChannel offers a decentralized and absolutely new path for stormwater treatment.

Please note that we only supply the filter bag and poly insert.

It is able to filter and bind pollutants like Hydrocarbons, heavy metals as well as Total Phosphorus (TP) and Total Nitrogen (TN). The pollutants then can be disposed of safely and easily.

The SPEL HydroChannel's modular design means that the stormwater is treated in two steps:

  • Solids and particulates are settled in the first step
  • Dissolved contaminants are then absorbed in the filter matrix


Water weirs over from the sedimentation chamber and passes down to the filter bag with the filter matrix inside it. Both organic and inorganic contaminants are removed by Adsorption and precipitation. The filtered water then flows within the Channel to the collection point where it can either be re-used or discharged to infiltration.

The initial sedimentation step ensures the long working life of the filter bag, and the granular filter material within it.

The filter is designed to promote an even and homogenous flow distribution within it. Separation of the material is near impossible, by proven and certified design. The pad will need be replaced at about 10 years, depending on site conditions.

Technical data

Length: 1000mm
Nominal diameter: 300mm
Catchment Area: Contact SPEL

Proprietary media

hydrochannel grated drains stormwater treatment
SPEL HydroChannel

hydrochannel grated drains filtration treatment
Grated drains filtration treatment

Modular Design

The innovative modular design is based on a standard 300mm channel width.

There is no need to make site specific or bespoke design amendments to the channel drainage runs.

hydrochannel installation steps

Based on the innovative filtration solution is the concrete nominal width of 300mm. Planners are not required to make any alternations in the drainage plan if they want to treat the water with the HydroChannel.

The modular interior of the HydroChannel:

  • The sedimentation box takes rough cleaning all solids such as stones, leaves, and suspended particles on. The rubber lip ensures sealing around the edges – for the reliable differentiation for subsequent filtration.
  • The pretreated rainwater passes through the granular-filter-pad and the organic and inorganic pollutants will be filtered from the water.
  • The filtered water flows over the baffle into the free flow area of the channel and is discharged per normal site requirements.

hydrochannel modular design
Modular design

Cross section

1 -Water comes from the surface to the SPEL HydroChannel

2 - The sedimentation chamber removes coarse solids, such as gravels, chippings, leaves and other solids. The rubber seal ensures a water tight seal is maintained.

3 & 4 - The pre-treated water pass through the granular filter bag, and the organic and inorganic pollutants are removed.

5 - The filtered water flows over the baffle into the free flow area of the channel. It can then be re-used, or discharged to surface or ground water via infiltration.

Please note that we only supply the filter bag and poly insert.

hydrochannel filtration treatment cross section
HydroChannel cross section

Selection Guide

hydrochannel selection guide