8
SUB-SURFACE INSTALLATION
PR-150-S oSK version can also be in-ground mounted.
NOTE:
The unit is ribbed and made from
sturdy HDPE. If the earth is well
compacted around the filter and a man-
hole is used, a carrying capacity of
several tonnes can be realised.
NOTE: PR150-S oSK
version can also be
sub surface mounted within a purpose-
built sump.
NOTE
: In below ground installations, at
least 150 cm of horizontal pipe should be
inserted on the inflow side of the filter to
calm the water flow before it enters the
filter, as water gains velocity as it falls
from the roof height to the underground
tank and this speed may reduce the filter’s
efficiency;
6. Maintenance
Your filter requires much less maintenance than other rainwater filters due to the hydraulic jump
design and the stainless-steel filter strainer design.
The filter should be checked 2-3 times a year for contaminants that may become caught in the
slotted trapezoidal sieve. Dirt and leaves found in the discharge area need not be removed because
they will be flushed out through the overflow with the next heavy rainfall. If water has accumulated
in the discharge area then the stainless-steel filter strainer may be blocked, but this is effectively
cleaned in a few seconds by using a hose or a high-pressure cleaner simply directed at the strainer.
By doing this the deposits, between the 0.8mm stainless filter strainer, can also be effectively
removed.
Alternatively, the filter strainer can be removed and cleaned manually. In doing so, it is important to
clean the filter collection area with a high-pressure cleaner to flush all dirt out through the emergency
overflow before removing the strainer. In this way, the clean strainer can be re-installed without dirt
and sludge fouling the lateral support guides to ensure a perfect fit.
By installing accessory
PR-RSDS-150-200 back-flush kit
then visual checks can be lowered to 2
times per year. In this case, external cleaning via the back-flush kit should also be done 2-3 times
per year
– either at the change of seasons or before heavier rain periods are expected.
