I decided to try and make my own DIY filter without spending much money. I went with a moving bed filter. Works something like this:
You basically just run water through a bed of small gravel, and the gravel is were all that good bacteria will grow on. On mine I also added some fast growing bamboo to aid in the organic waste removal.
$4 at home depot.
Old water jug and a powerhead I already had.
Filled up with gravel about half way and dumped it in the pond.
Sticks out above the water line so water can splash back in, aerating the water a little.
Here's the other side
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I grow my orchids outdoors from late spring to early fall. Never thought of landscaping them around the pond like you are doing. Hmmm. Need to think about that some more. Not to be a wet blanket but some of those you have prefer more filtered light. It appears yours are in full sun. Maybe something to think about.