My shop vac has a pump that will drain the water out of the vac. You
sometimes see them advertised for clearing flooded basements. The discharge
pump is rather small and requires the intake of water to be turned off for
periods of time to allow it to catch up. If you overfill the shop vac,
their is a switch that shuts the pump off, and you have to hold the start
button down for a while to get the water level down enough for the shut off
switch to stay reset.
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RichToyBox
http://www.geocities.com/richtoybox/pondintro.html


"camper" wrote in message
. ..
I am thinking about buying a small Shop Vac to help clean my pond. Is
there
a model that will blow out the water rather than holding it in the tank?
That way I will not have to empty it every few minutes.

Also, what is the best product to clean green water? I have been using
AlgaeFix from Pond Care and it seems to be clearing it a little, but it is
still very green.

Thanks for any help.