Hydrorock is made with natural materials

The core of a Hydrorock block is a mineral wool similar in composition to loft insulation batts. They are made from basalt, an abundant volcanic rock, which is melted and spun into fibres. These blocks are then wrapped in a geotextile membrane which prevents clogging with debris and silt and makes them easier to install.

As the surface water passes through the highly absorbant Hydrorock core, impurities and pollutants are filtered out, enabling clean water to be released locally into the surrounding soil.

Compared to alternative solutions like crated tanks, the installation of a Hydrorock sustainable drainage system massively reduces the use of plastic products.

Tree-lined country road with narrow verges - Surrey

As the rain or surface water runoff passes through the blocks it is filtered


Hydrorock blocks can absorb water up to 94% of their volume, so they take up a lot less space than alternative solutions and can be dispersed across a site rather than installed at a single centralised location.

As soon as Hydrorock blocks start to absorb water, they also begin to slowly release it through their permeable membranes into the surrounding soil. This effectively increases their buffering capacity beyond their volume. Once the blocks become more saturated, the speed of this infiltration increases.

As a result of these two product characteristics, Hydrorock complies with one of the key tenets of SuDS (sustainable drainage systems) in working in harmony with nature to keep the water on site.

The use of blind Hydrorock blocks with no plastic channels in them reduces buried plastic even further

The reduction of plastic is very important to Surrey County Council and in Tilford Street they have taken the next step towards a no plastic future by using Hydrorock blocks without channels. As long as each block is touching at least one other, capillary action occurs and a unitary aquifer can be created.

As well as buffering the surface water during a rain event, these aquifer blocks slowly release the water into the ground on site, rather than having to feed into existing drainage for processing and release elsewhere.

Stefan Jankowski of Surrey County Council

We have live projects in the UK where Hydrorock natural aquifer blocks are being installed to reduce plastic and to provide sustainable drainage solutions to persistent highway flooding.

If you have a surface water management project where working more in harmony with nature would be a benefit, please contact us to see if Hydrorock Solutions can help.

  • Faster

  • Easier

  • Simpler

  • Cheaper

  • Greener

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Our team will help you find an effective, sustainable water management system for your project. We support you from design right through to installation.

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