You can (meaning they will work if you buy one the right size for the gallons you plan to filter) but they are not rated for outdoor use so they won't last long in inclement weather (they do not freeze/thaw gracefully) and pose a major electrocution risk in wet weather. If your pond is on the patio and you can be sure the pump stays dry, it could work.Can you use an aquarium canister filter
for pond ?
Or is it not safe to use outside ?
I see in another thread that you're looking at a waterfall box. I use an 8" waterfall box with bio-media in it and a box filter in my small pond with a 1200GPH pump and it works very well. Here are the items I use that work very well for my small pond:Unfortunately I think it would get wet but we don’t get that cold it would freeze
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