Schedule 3 - compliant solutions for developers

Developers need to get their projects through planning smoothly  and quickly, with solutions that provide reliability and predictability, not just in installation, but in application and long term efficacy.

Hydrorock natural aquifer block solutions deliver all this and more, with less installation time and more sustainability than competing solutions.


As infiltration and buffering solutions that keep rainwater on site, reduce surface water and therefore run off, Hydrorock helps meet Schedule 3 – and many Local Authorities are now adopting Hydrorock as their go-to Schedule 3-compliant solution.

Not only is Hydrorock intrinsically sustainable as a product, with 100% recyclability at end of use, it offers nutrient neutrality on site by infiltrating water directly into the ground locally.

A further significant benefit is Hydrorock’s absolute configurability. This means not only that site design can be flexible, with unusual shapes easily accommodated and smaller units incorporated, but also that in-ground problems and obstacles can be resolved ‘on the fly’ with simple reconfiguration, minimal fuss and almost no delay.

Hydrorock benefits for Developers

  • A highly innovative, 100% natural, stone wool product
  • Schedule 3 compliant
  • Completely configurable
  • Shallower installations possible
  • Deals with unusual or narrow sites easily
  • Small units can be designed and installed house by house
  • Optimises land use
  • No monolithic plastic sumps required
  • Made from Rockwool pre-wrapped in a protective geo-filtration membrane.
  • Hydrorock provides natural aquifers wherever needed to control and provide space for surface water.
  • Hydrorock absorbs 94% water capacity by cubic volume
  • Hydrorock is 100% sustainable and 100% recyclable
  • Hydrorock is a plastic-free, void-free solution
  • Hydrorock is easily configurable, easy to handle, easy to install
  • Hydrorock push fits or butts together to form modules and fully dispersable arrays for attenuation, infiltration and irrigation solutions for new and retrofit projects.
  • Hydrorock requires less excavation than traditional systems
  • Hydrorock is maintenance free and very durable

Schedule 3

With Schedule 3 of  the Flood and Water Management Act 2010 now in force any new development must include high quality SuDS, and the automatic right to connect to public sewers for developer has been removed.

Sustainability is at the heart of SuDs so it’s vital that the solutions employed to deliver it are themselves sustainable.

Hydrorock is uniquely positioned to deliver this sustainability as an integral part of your surface water management and flood risk plans.

Hydrorock natural aquifer blocks maintain the natural water cycle, delivering effective, long lasting, Schedule 3-compliant solutions across a range of applications – from planters, to tree-pits, rain gardens to soak-aways, and permeable paving to irrigation – all fully integrated infiltration and attenuation systems with the capacity to provide solutions designs and projects with complex water management needs



Click here to use our calculator and quickly calculate the number and volume of Hydrorock natural aquifer blocks needed for your application.


Hydrorock natural aquifer blocks are available to provide 100% sustainable, 100% recyclable water management solutions.

D Block
D Block
BD Block
BD Block
DHD Block
DHD Block
BDHD Block
BDHD Block
BD Block
IR Block
LG Block
LG and SL Blocks
IP Range
IP Range
Filter units
Filter units
Hydrorock fixings and connectors
Hydrorock fixings and connectors