1. Excavate a suitable area to allow for the installation of the 600x600x700mm pit.

2. If additional depth is required a 600x600x300mm riser is available.

3. If installing in a driveway allow an additional 150mm above the top of the pit for a 150mm thick concrete collar.

4. Provide a layer of filter fabric and a bed of at least 50mm of sand under the pit.

5. Cut the holes where required above the filter basket for the inlet pipe and below the filter basket for the outlet pipe.

6. Provide a couple of weep holes in the base of the pit to allow excess water to drain.

7. Insert the pit into the excavated area and fit pipes as required.

8. Allow each pipe to protrude 25mm inside the pit and seal with silicone.

9. Backfill the pit and compact the surrounding ground ensuring that the pit is backfilled where the recessed compartments are. There should be no movement of the pit in the ground following this step.

10. If installing in a driveway set a collar of concrete around the top of the pit to allow a 540x540 galvanised grate to be dropped in. The collar should be set into a re-inforced concrete slab so there is no actual weight on the pit itself.

11. Ensure that the stainless steel basket and filter bag are placed inside the pit.

12. Unless installed under a non load bearing slab, the pit is non-trafficable.