You could build the pond now, and then retrofit a skimmer later. It's not
mandatory like aerator/filter.

daryl wilde wrote:

The area I am wanting to use is off the back patio and is partially covered
by a Oak tree- yes I know not the best spot for a pond, and I am concerned
with this but this is where we want it so we can be close and enjoy. This is
why I am looking for skimmer and waterfall box plans - $400 is just too much
mula.