The pond winterization process actually begins in fall. Towards the end of October as the water temperature drops to 50 degrees your biological filter stops functioning as the bacteria mostly dies off, and your aquatic plants start to die back. Dead organic matter dropping to the bottom of the pond creates an anaerobic situation and releases gasses that can become toxic to fish. Your fish can no longer digest high protein food and should be fed either cool weather food, or not fed at all. Your UV sterilizer should be turned off and your skimmer cleaned more frequently. To ensure better water quality and preserve your investment certain tasks need to be done.
Fall maintenance tasks include the following:
- Protect your fish health by changing to cool season food.
- Cut back aquatic plants, clip and trim dead plant material, remove annuals like hyacinth and lettuce, prepare plants for winter.
- Check the pump and clean the volute
- Check the skimmer frequently during fall leaf drop and winter winds.
- Clean the biological filter, drain and store for winter
- Turn off the UV Sterilizer and (when practical) drain and store.
- Skim the pond and remove as much dead organic plant material as possible.
- Lift the pump to winter height (When practical)
- Net the pond to collect falling leaves. (When practical)
(Because every pond or water feature is unique, you may not have all of the items listed.)
Fish Health: As the water temperature cools fish cannot digest their food as efficiently. High protein Summer food can actually rot in their gut and cause abscesses. As the water temperature drops below 60 degrees you should switch to a cool season, or Spring/Fall food that has more wheat germ which is easier for your fish to digest. When the temperature drops below 50 you should stop feeding your fish entirely until Spring.
Plant material: When the water temperature drops plants start to die back. Cut back plant material that is decomposing and dropping to the bottom of the pond. Dispose of annual plants before they can sink to the bottom. Don’t cut back anything that is evergreen.
Pumps: Two common problems that shorten the life of your pump and void your warranty. First, never pull your pump up using the cord. Stretching the cord can weaken connections within the pump or cause a leak in the seal around the cord. Either problem will cause the pump to start shorting out your GFI and you’ll need a new pump. Pump manufactures exclude cord problems from their warranty, so never let anyone pull your pump by the cord!
Another pump problem is gunk clogging the inlets. Even clients who have a skimmer need to periodically close the door to the skimmer and let the pump empty the skimmer box. Then look in the back of the skimmer box where the pump is and make sure no pine needs, or other gunk has gotten back there. If you don’t have a skimmer you must be even more diligent in checking your pump. If you ever notice a reduced volume of water coming out of the pump it is a sign that something is blocking the inlets to the pump. Most pumps are water cooled. If the inlet to the pump is blocked it works harder to pump. As it works harder it heats up internally. Eventually the pump gets so hot that the seal keeping the water out fails. Once this happens your GFI start shorting out. Failure to keep the pump inlets clear voids your warranty and shortens the life of your pump, so make it a habit to check the inlets periodically, especially in the fall when the wind starts to knock all the needles out of your Douglas fir.
Skimmer: As the leaves and needles start to fall it is important to clean your skimmer more frequently. Once the leaves have all fallen you can clean it less often through the winter. Remember that you must periodically pull the filter matting out of your skimmer and hose it off very well to clear the needles out of it.
UV Sterilizer: As the water temperature approaches 40 degrees algae growth becomes less prevalent. We suggest that you turn your UV sterilizer off by unplugging it on or about October 15th. If you turn it on in April and turn it off in October you can use the UV bulbs for two full seasons and replace the bulbs every third year. If you don’t turn off the UV by unplugging it, then you should replace your UV bulbs every season. If you keep your pump running all winter then you don’t usually have to drain your UV. If you plan on turning the pump off during the winter then the UV sterilizer valve should be closed and the UV drained to protect it from freezing.
Falling Water Designs suggests that you run your pump all year long because moving water almost never freezes and your pond will be healthier if you keep the pump running.
Biological Filter: Those clients who have a biological filter (which is not the up-flow filter that many have at the top of their waterfall), can clean and drain it for the winter. Once the water temperature drops to 40 degrees the beneficial bacteria in the filter mostly die and quit working. Cleaning and draining the biological filter will prolong the life of the filter media. Here’s our how to video.
Finally, if this all seems like too much work, Falling Water Designs offers Fall Prep as part of our Maintenance Plan. Just give us a call at (206) 323-2873 to schedule your prep for Fall.
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