Advantages:Cheaper, costs less to run
Disadvantages
Needs valves to connect to pipe work, must be protected from
elements, not designed for the job
It is a fact that koi pond owners do use these, but they change
the actual pump housing to a purpose made plastic version, so that
is more cost.
As the pump is steel they will rust over time, which is why koi
keepers change it. In its normal use that of central heating, the
water is in a continuous loop, so it can be almost anywhere on the
system.
But a water feature is NOT a closed system (air gets in at the
feature) so in order for this to work you must have the pump lower
than the sump, and as the sump is in the ground the circulator will
need protection from the elements and the ground its in, also you
will need more pipework, one to flow to the water fall or feature
and one to flow from the main sump to the pump, its not looking that
good now is it?
So yes you can use one but for a water feature it is going to
cost you more than a submersible pump will.
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