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For ponds over 500 gallons we will almost always recommend an external pump.  When using an external pump, however, you will need a way to get the water out of the pond and to the pump.  Bottom drains that are installed into the liner are the most efficient types of water pickups you can install.  A vacuum type drain is the next best thing then a straining basket on the end of flex hose. 

When choosing the right bottom drain for your system you must keep several things in mind.  Are your fish so small that they can be sucked down the drain?  Can you install the drain into the liner or does it need to sit on top?  Are you comfortable (with illustrated instructions and personal guidance) with installing a drain into the liner? (It sounds harder than what it is, by the way...)

To get more information on bottom drains for a garden pond, visit The Pond Doc's Pond Construction Education Center.  Here are a few articles that should be of help to you also:

Read Up!  These articles contain information about bottom drain usage and installation methods. Singing the Praise of the External Pump The Doc's Dream System -- A Construction Guide to Backyard Ponds Pond Planning Pitfalls & Problems RetroFit Your Pond for Fish Read More Articles at What's Up, Doc?, The Pond Doc's Online Newsletter

Can you use a tube of E-6000 to Waterproof your Drain?  Click HERE.

Can you use a tube of E-6000 to Waterproof your Drain?  Click HERE.

Used to retrofit existing ponds and where conventional bottom drains cannot be installed.  Note:  Small fish (smaller than 6") can be sucked up into the drain.  A protective basket is available that can be placed over the drain to protect fish from being sucked into it until the fish get large enough. Vacuum bottom drain has 2" connection.  In most cases a check valve is necessary to prevent water from vacating the leaf basket of the external pump and draining back into the pond, thus loosing the pump's prime.  An EZ Fit option is available that already has the check valve (back flow preventer) installed and is easily connected to 2" hard PVC.

Item #InvDrain.................$ 79.95
with EZ Fit Option...........$ 118.95

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