Fishmate (Ani-mate) produce a range of world famous, low cost gravity fish pond filter that are available with an integrated UV and are designed for external pond use.
These external gravity pond filter models are colored green to blend in with the surroundings and fitted with an easy to remove lid for access to filter internals.
You should stop feeding your aquatic plants about a month before the first frost in your area. Even in areas that don't normally have frost, plant growth slows in the shorter, cooler days of the fall and winter months.
