© 2011 Rainwater Harvesting Ltd - All rights reserved.
Carat with Optimax and Rain Director or Mains Backup
RWH 042
Rain Director
®
and Mains Backup in a Box
®
are registered Trade Marks and may not be used without permission.
Page 5
b) Installing the tank
Proximity to buildings. The tank must
not be so close to any building that it
compromises the structural integrity of the
foundations. To assess this distance, draw
a line on the side elevation plan from the
base of the foundation at an angle of 45
degrees downwards and away from the
building. No part of the tank should be
within this line.
Slope. On a sloping site the ideal position
for the tank is on a low part of the land.
Rainwater flows readily from all the gutters
to the tank and the submersible pump can
easily pump it back up round the building.
Depth. The maximum depth the tank can
be installed is 1200 mm from Ground to
top of tank excluding dome (turret). We do not support installations deeper than this
because of the difficulty and danger involved in accessing such deep equipment. More
than one Graf extension sleeve or a self made concrete inspection bay using concrete will
invalidate warranty in terms of our technicians retrieving damaged or faulty parts. Ensure
the hole is dug to a depth which permits the tank dome cover to be at the required level
(usually ground level) even though the turret has a lot of leeway for final adjustment.
Complete the mounting of the tank in its final position, leaving the surround of the tank
dome free for piping.
Note: Do not back fill around the tank dome until the collection and soakaway plumbing
has been installed.
Back-filling. Read the manufacturers’ installation instructions (below) thoroughly; the
size of the hole and the procedure for filling with water when backfilling the outside of the
tank are given there. The Carat tanks are strong enough that they do not
need concreting
in. Backfill to the shoulder of the tank with pea shingle and round the turret with spoil or
top soil (installation under garden, Graf image page 7) or pea shingle all the way up
(installation under concrete or driveway, Graf image page 5).
x
Surface Water. We advise against letting surface water run
into the tank. Any spill or mess on the ground could get into the
tank. Furthermore, grit and other debris can be destructive to
the pump. Do not run the roof downpipes to the tank through a
ground gutter i.e. only sealed gulleys should be used.
c) Soakaway
