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How to Winterize Your Pond

by Marquis Gardens Team 15 Sep 2016 0 Comments
How to Winterize Your Pond, Winter Pond


Winterizing your pond starts in the fall before the leaves begin to fall. The procedures you follow will not be based on the calendar schedule, but instead on water temperature, first frost and when the leaves begin to fall.


Have a thermometer handy to monitor water temperatures for fish feeding. September/October is usually the time when water temperatures will begin to drop.

Pond winterizing - video

Need To Know!

FOR ZONES 4a-7a (GTA and surrounding area)


Pond Koi Fish

Pond fish and koi are able to overwinter in a pond that has a 42”-48” depth (or more) at it deepest point; as long as there is a pond heater and aeration supplied.

For ponds that are less than 42”, fish can be brought indoors and kept in a holding basin with aeration and filtration


Aquascape Pond De-Icer

A Pond Heater is used to keep a small hole in the ice through the cooler weather when a pond would usually freeze over entirely. It is not used to heat an entire pond, as this is unnecessary. A small opening must remain in the ice to allow for the release of harmful gases.

Aquascape’s Stainless Steel Pond De-icer/Heater is only 300 watts and is thermostatically controlled. When the red LED light is on the unit is heating, when the blue light is on the unit is still on, but not heating, allowing for better energy efficiency and the ability to know if your unit is working.


Pond Aeration

An aerator allows for an increase of oxygen in the water over winter months, hot summer months and at night when oxygen levels are generally lower.

Your pond and fish are dependent on oxygen and with low running costs; it makes sense to run your aerator all year round.

Suggested Pond Winterizing Instalation

The following takes place in the fall when the leaves begin to turn colour and the temperature begins to drop

10 Steps to Prepare Your Pond for Winter

Step 1:

Cold Water Beneficial Bacteria - Begin Using Cold Water Bacteria once the water temperature has dropped below 50°F/10°C. This will aid in breaking down debris and sludge before winter sets in.

Aquascape Cold Water Beneficial Bacteria

Step 2:

Change Fish Food - Once water temperatures have reached 50°F/10°C change to a Fall/Spring food that has a higher wheat germ content that is easier for the fish to digest in cooler temperatures. Stop feeding the fish all together once the temperature has reached 45°F (7°C).

Aquascape Cold Water Fish Food

Step 3:

Plants - All Hardy water lilies and submersible plants (parrot’s feather) can be dropped down to the deepest point in the pond for the winter. Cut back any foliage from the lilies to limit decaying matter in the pond. Floating plants like hyacinth and water lettuce can be removed and disposed of. Hardy marginals can be trimmed back, leaving approximately 2-4” of the plant from the base. Tropical water plants should be brought indoors in a sunny area and treated as a house plant, always keeping the soil moist or a tray of water beneath.

Artificial Pond Plants

Step 4:

Aeration - Move air stones from the deepest region of the pond to half the depth of the pond or 2’ from the bottom for the winter. The air stones should not be near the fish or at the bottom of the pond, as they will transfer cooler air to where the fish are.

Pond Aeration

Step 5:

NET/VACUUM - If there are any loose leaves or debris in the pond, remove with a skimmer or pond net before the fish begin to go dormant. The less waste left in the pond over winter the better for the safety of the fish. A Pond Vacuum can also be used to clean the bottom debris from the pond. After the pond is clean, cover the pond with a net before the autumn leaves fall. This will save you a lot work removing the leaves by hand.

Aquascape Pond Netting

Step 6:

Pumps - Turn off, clean and store all pumps indoors in a pail or container of water; this prevents the seals on the pump(s) from drying out. If your pond is 4’ or deeper the pumps can be left at the bottom of the pond as an option.

ProEco Filtration Pump

Step 7:

Lighting - Remove underwater lighting before any freeze occurs or if your pond is 4’ or deeper submersible lighting can be lowered to the bottom of the pond.

Underwater Submersible Lighting

Step 8:

FILTERS/UV - Remove the pressurized pond filter and do a thorough clean out of all the media. Store the entire unit indoors to prevent cracking/damage to the unit. Also remove any additional UV systems from the pond and store indoors. This is a good time to check if the UV bulb and/or filter media needs replacing for the upcoming spring and to clean the quartz tube housing.

ProEco Ez-Press 2000 Pressure Filter

Step 9:

IONIZER - Bring the head of the Ionizer in for the winter (the threaded part with the anodes) and clean off the anodes so they are prepped for spring.


Step 10:

DE-ICER/HEATER - Before the water’s surface freezes over entirely, float a de-icer/heater towards the middle of the pond or over the deepest area of the pond. Throughout the winter you will be able to see the LED light on the heater and know that your heater is working.

Aquascape Pond De-Icer
* We do not recommend having moving water (pump running) in the winter, as it disturbs the fish by shifting the cooler water on top to the bottom where the fish should not be disturbed.
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