"Just Me "Koi"" wrote in message
...
snip
Should the pump fail, the backflow device will stop the water from the
biofilter from going back into my pond thru the bottom drain. With this
setup if your pump fails then there will be no backflow into the pond.

The backflow valve is only needed if the VF is above the pond right? If they
are at the same level, they should equalize, correct?

The pipe breakage issue is a different problem that can be corrected with
a
level switch similar to what you have in your fuel pump. Get this type of
switching device from your local plumbing supply store, connect the switch
to your pump. If the level goes below a predetermined level, then your
pump
will shut off. (I will do some research into this myself soon and will
report back to the group)

I'd love to hear what you find out.

BV.