Graf Biomatic Instrucciones De Montaje página 53

6. Installation Instructions for the Plant
6.5 Installation Instructions for BIOMATIC Modules
Step 1.
100
The base of the drainage pit must have a slope of between 1 and 2 % in the direction of flow. The walls of
the drainage put must be vertical. A layer of compacted round-grain gravel (max. grain size 8/16 mm,
thickness 100 – 150 mm) must be applied as a foundation.
Step 2.
100
A geotextile is placed above the layer of gravel.
Step 3.
100
A PVC film is placed above the geotextile.
52 / 96