check this inexpensive filter out. you can keep adding to the system if
required.
http://www.geocities.com/ghawkins_ca/barrelfilter.html

"daryl wilde" wrote in message
...
The cost of the skimmer and filter box are expensive ~$500 or more. Has
anyone seen plans to build one? Any special concerns??

Thinking of using either external quality (CDX) or marine grade plywood
and
then covering with liner......comments. Expect the pond to be 6 ft x 8 ft
or so and 18-24in deep.

Thanks Daryl