The eight geese and two dogs foul up the goose pond in about 4.5 days during the summer. The pond filter we have used for the last few years was a pressurized number that used an external pump. The old pond pump worked under horrible conditions. It had to pump goose poo "soup" continuously. It was stepped on when the dogs jumped in to cool off in said soup. The geese chewed on the power cord while making aforementioned soup... you get the idea. We have gone through a lot of pumps. The current incarnation is more of a pump in a cage. We have a regular 500 gallon per hour pump in this box (http://www.homedepot.com/p/Total-Pond-Mechanical-and-Biological-Filter-Kit-MF13010/202278958). It is connected to a 15 foot length of lead free 5/8 lawn hose connected with a ½ inch adapter. The old pond filter was just too small to take - err – "soup" and make it spring fresh.
<insert boring design explanation of latest pond filter operation>
I wanted a large three stage filter. The first stage is mechanical filtration at the pump to make sure that the submerged pump runs without incident. The second stage is a a clarifier so that any particulate that makes it past the mechanical stage settles out before the third stage. The third stage is the biological stage. Bacteria - living in some sort of media - consume and filter out the remaining wastes still in the water. For the media, I am using three bags of lava rock.
<end boring design explanation of filter operation>
The resulting filter is part gigantic aquarium filter, part pond filter, and only slightly overbuilt (I hope). I used the filter described here (http://www.runnerduck.com/pf1.htm) as the basis for the new filter with just a few modifications. I switched to 55 gallon drums. I added an extra tank for a clarifier. And swapped out the filter pads for 3 bags of lava rock to host the aquarium bacteria that were going to convert the soup to clean water.
Here is a is the end result...
|[the completed project]|
|[media tank BEFORE lava rock was added]|
Trying to make your own out of pipe pieces scavenged from the plumbing aisle only results in leaks, cursing, and a floor show for the geese who inevitably arrive to supervise.
Second: size the outlet bigger. But maybe not this big:
|[the outlet. the filter screen below in the pond was temporary]|
Here is the inside of the media barrel with water running through it.
*d.a. writes: the aforementioned "dump" is actually pumped out to each of the fruit trees. It takes awhile to do so, but we don't waste water here in South Central Texas, y'all.