Filtering - Lorentz PS Série Manuel D'installation Et De Fonctionnement

8.5.4 Filtering

CAUTION – Sand, clay, rust or other solids
will cause rapid wear or immediate
damage to the pump.
lf your water is free of any contamination, the LORENTZ fine
intake strainer will provide sufficient protection. The use of
the LORENTZ intake strainer is recommended as third-par-
ty solutions may not be sufficient. Since water conditions
can be subject to change, the additional use of a filter is rec-
ommended.
A 30 inch intake filter/foot valve is necessary for pumps low-
ered into wells. For other installations an inline filter is best,
installed close to the pumps' intake. lf filters are expected to
clog often, maintenance may be minimized by plumbing two
or more filters in parallel. The inline filter has a clear bowl so
its condition may be observed.
CAUTION – Have replacement cartridges
ready.
Filter cartridges are available at retailers and local wa-
ter system suppliers. LORENTZ recommends the use of
10-20-micron "spun polypropylene" type filters. Carbon
taste and odor cartridges have less capacity for dirt, more
resistance to flow, and are more expensive to use. Use them
only if you have taste and odor problems.
A filter cartridge may look clean and still be clogged, due
to fine silt embedded in the fibres. If the pump becomes in-
creasingly noisy over time, it is usually due to a clogging fil-
ter cartridge. On the other hand a cartridge that looks dis-
coloured may not be clogged. As long as the pump runs qui-
etly, the filter is okay to use. The pump noise is an indicator
for the need to change cartridges.
Pump Installation
Iron pipes or fittings will introduce abrasive rust particles
if installed on the intake side of the pump. Dirt is also intro-
duced as pipe joints are assembled, especially in a trench.
CAUTION – Make sure inlet lines and
fittings are flushed clean before attaching
them to the pump.
The inline filter may have a red push button valve to release
pressure for maintenance. If the filter is placed more than a
few feet above the water source (at lowest level) the suction
may open the valve and introduce air. Prevent this by seal-
ing the surrounding area of the push button with silicone
sealant or epoxy, or replace the button with a nut, tight-
ened down.
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