Many thanks for your response. Looked at your pond pages--impressive.
Water exiting pond via 1 1/2 inch tubing terminating in broad mesh
screen on bottom of pond. Material being trapped is relatively
small--appears to be fragments of floating plants rather than leaves.
30 gallon unit cosmetically unacceptable (like wires to the stereo in
the living room). Will watch the KH.

BA Finstead