Inst.375 Astral Pool CONCRETEInstructions V10.15
4
3.
Install a second conduit to return below ground level and away to the power supply. Both conduits
should be glued into a draw box to allow for future service.
4.
Press the larger polys
tyrene foam insert (item 26938) into the niche’s front opening. This temporary
insert will stop dirt, concrete and debris entering the niche and will maintain roundness of the niche
under the weight of the concrete. The foam insert must be a tight fit inside the niche.
5.
Cover the entire niche surface with concrete in a uniform manner to ensure secure fixing. Ensure the
concrete covers the niche all around and at the back
–
air pockets and bubbles in the concrete must
be eliminated. Avoid creating thin sections of concrete to minimise the risks of cracking or leaks. It is
imperative the front edge of the niche does not stand proud of the concrete or sit recessed to the
concrete. Ensure there is at least 50mm of concrete behind the niche.
6.
Smooth the concrete around the niche and make a recess around the rim of approximately 8mm, to
allow for installation of a waterproof seal.
Steel bars
Draw Box
Conduit to Power
supply
Ensure concrete thickness of 50mm
minimum around niche
Ensure that conduits are “broken”
- even if a
junction box is not fitted - before returning
below water level. This will stop the water from
being siphoned from the pool or spa.
Conduit
Steel Bars
Scoop out concrete around
front edge of the niche and
apply waterproof sealant in
recess as depicted
If required, trim niche back
a few mm only to be in line
with concrete wall surface.
Flush mount is essential.
Concrete thickness
50mm minimum
