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Yes, natural pools can get algae since they use the same filtration processes as lakes or streams. However, you can reduce the risk of algae by adding more algae-fighting plants and not installing your natural swimming pool in direct sunlight, as it promotes algae growth.

You have several options for your pond by getting your yard ready for the winter. You can winterize your koi pond by ensuring it’s at least 5 feet deep so it doesn’t freeze completely, installing a pond heater or aerator and having it run at all times, and installing a deicer if temperatures are dangerously low for an extended period. You can also choose to shut down your pond for the winter by removing all the wildlife in it and bringing it indoors, cleaning out the filter and pump, and then covering the pond with a tarp.

When deciding whether or not to turn off your pump, you should consider your area’s climate and the aquatic life in your pond. If you live in an area with freezing winter temperatures and don’t have any wildlife, keeping your pump on could damage it. If you have aquatic life but live in a colder climate, you might consider keeping your pump running and adding a pond heater.

Like pools, ponds can be a safety risk, so they may increase your homeowners insurance. Be sure to let your insurance company know if you build a pond on your property—they may have safety requirements in order to keep your premium from increasing.