On Mon, 22 Mar 2010 01:34:01 EDT, "Pat" wrote:

My main pond holds 24,000 gallons. A water change takes a week or so.

Oh.... yeah, that could be problem. The current koi club president has her
koi in an old swimming pool. She runs a small pump to a sprinkler and
waters her grass 24/7, one hose is filling and the other is watering the
lawn (which she moves periodically). ~ jan
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Zone 7a, SE Washington State
Ponds: www.jjspond.us