Gully-Fed Filter Drains Solutions

• Roadside and paving options
• Excellent filtration of pollution
• 30 year filter guarantee
• Double the water storage capacity compared with gravel
• No temporary shoring works required
• 15% less soil excavation (by volume and weight)
• 60% less infill weight
• Far fewer vehicle loads required with Hydrorock
• 33% bigger infiltration surface area (much more efficient than gravel system)
• 30 year filter life (double gravel 15 year filter life)
• Free recycling by Rockwool (gravel needs expensive cleaning)   
• Full integration with other Hydrorock infiltration or filter drain systems
• Excellent load bearing up to 40 tonnes and life time system integrity
• Uniquely high absorption to volume ratio (94%)
• 100% natural product
• Recyclable

Installation is very simple and quick with minimal disruption.
Blocks are pre-wrapped with filter membrane, so the excavation needs to be only as large as the system (no access is required to fit the membrane).

• No specialist installation engineering or equipment is needed, with
  simple snap-together fittings which require no special skills or tools.
• Hydrorock Blocks are used in a single layer, on a 100 mm layer of sand. This increases the surface area of the bottom of the system.
• The Hydrorock Blocks are normally installed in a module three blocks wide. This allows for the system to self-vent, and if by human error the filters are compromised, the whole system can be flushed.
• Hydrorock BD blocks have integrated perforated pipes allowing rapid inflow and storage water in each block underground.
• Additional capacity can be rapidly and easily achieved by the addition of further Hydrorock BD blocks or Hydrorock B blocks (pre-wrapped but without integrated pipes)
• The system can be placed around existing infrastructure, such as pipes and cables unlike crated sumps. This flexibility allows for optimisation of the site.
• Placing the system on a 100mm layer of sand will permit infiltration from the module into the surrounding soil and facilitate the discharge of water from the Hydrorock Aquifer Blocks.