Astralpool Wellma Manuel D'installation page 8

PLEASE NOTE
The diameter of the water drainage tube of the drainage opening
should be at least 70 mm, due to the large quantity of water consumed
in a short period of time (about 100 litres of water / minute).
The slope of the grid must be a minimum of 2%.
To correctly seal the floor, place asphalt seals on the whole surface of
the room and if possible make it overlap 250mm with the vertical walls.
Installation Manual–Wellma Showers
2 Before using the equipment
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