Fall is a great time to prepare the pond for winter. In order to reduce gas build up during the winter months, more frequent or more thorough cleaning of the pond is recommended. An easy way to clean organic matter from all nooks and crannies of the pond is with a PondoVac.
As the weather gets colder, feeding fish should be dialed back and appropriate foods used.
As the temperature falls below 45°F, bacteria activity stops and with it the biological filtration functionality of the pond filter system. It is now time to stop feeding fish and to consider winterization of the filter.