DrainEezy® Filtration Systems

These innovative hydrocarbon filtration systems are a cost-effective alternative to oil water separators. They plug straight into site drainage pipework and extract hydrocarbons from surface water run-off. Water exiting the system can be discharged directly into the environment.

  • Plug-and-play water remediation
  • No power or internet requirement
  • Minimal maintenance
  • Remove hydrocarbons to regulator-approved levels
  • Three systems: Mini, Midi and Maxi

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GRR922002WRC DrainEezy Mini Filtration System (1 Filter) 115 x 41 x 56cm Up to 14L Oil Up to 80L/min
GRR921002WRC DrainEezy Midi Filtration System (2 Filters) 167 x 86 x 31cm Up to 14L Oil Up to 80L/min
GRR921004WRC DrainEezy Maxi Filtration System (4 Filters) 167 x 86 x 61cm Up to 28L Oil Up to 160L/min
GRR031000HRF DrainEezy Oil Removal Filter 59.3 x 29cm
GRR031005ACRF DrainEezy Activated Carbon Filter 59.3 x 29cm

Product Overview

How do you filter hydrocarbons from water?

Green Rhino’s pioneering drainage products use smart polymer technology to extract hydrocarbons from water.

Smart polymers are materials that change in response to external stimuli. The smart polymers we use react with hydrocarbons turning them from a liquid to a solid or semi-solid state.

We have developed proprietary blends of smart polymers optimized to work with a range of hydrocarbons.

Contaminants like transformer fluids, fuels, motor oils and even the complex hydrocarbons in wood preservers like Creosote, can be successfully extracted from a flow of water as it drains freely into the environment.

The filtered water contains less than 5ppm of hydrocarbons, the benchmark for complying with pollution prevention regulations.

The smart polymers are contained within the DrainEezy™ Filters inside the Filtration Systems.

Why use DrainEezy™ instead of a traditional oil water separator?

  • Reliable filtration not prone to failure
  • Minimal maintenance required
  • No power requirement
  • Quicker, cheaper, safer installation
  • Easy to access for inspection and sampling
  • Consumable filters can last years on low risk sites
  • Dispose of spent filters in standard hazardous waste bins


Which DrainEezy Filtration System should I choose?

There are three models of the DrainEezy Filtration System: Mini, Midi and Maxi. They offer different levels of water remediation.

The DrainEezy Mini Filtration System is designed for low-risk applications where the level of contamination is likely to be light (e.g. car parks). This system includes a single DrainEezy Smart Polymer Filter.

The DrainEezy Midi and Maxi Filtration Systems offer sediment and hydrocarbon filtration for higher risk sites. Originally developed for use by DNOs on utility pole and sleeper storage sites, they are suitable for any location with serious hydrocarbon contamination.

Water first passes through three grades of sediment filtration: coarse, medium and fine.

The Midi and Maxi system uses smart polymer filters and activated carbon filters to tackle the complex aromatic hydrocarbons found in wood preservatives like Creosote. There is one of each in the Midi system, two of each in the Maxi system.

In the final chamber of the system are two Green Rhino Oil Removal Pillows to remove any remaining contaminants before water is discharged.

See the specification table for capacities and flow rates.

What maintenance is required?

There are no moving parts and no electrical or electronic components in DrainEezy systems. Therefore there are no failure points.

Sediment media in the Midi and Maxi systems should be removed and cleaned when necessary.

The smart polymer filters will need replacing when they reach capacity. You’ll be able to tell when they need changing because the flow rate will reduce to a trickle or stop altogether causing a backup of water. Before replacing the filters, however, check that the water inlet isn’t blocked with leaves or other debris.

When you change the smart polymer filters we recommend you change the activated carbon filters as well. On a low risk site, filters may last for years before needing to be replaced.

We offer Service Packs which include replacements for all the sediment and oil filtration media in each system.

How should spent filters be disposed of?

Used smart polymer and activated carbon filters should be disposed of with hazardous waste

What is water remediation?

Water remediation is the process of removing contaminants from water.