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Step 1
Check out the GPH (gallons per hour) number. This is perhaps the single most important thing to know about an up-flow pump. If the filter makes the water flow too quickly, your system can fail. If you choose something that flows too slowly, you end up with a mucky pond of sludge. Make sure to find the right size for your pond. In general, you want to filter your pond at least once every 2 hours.
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Step 2
Get a good warranty. It's important to check your up-flow filter often to make sure that it's operating properly; if not, send it in to be repaired. By choosing an up-flow filter with a good warranty, you can protect yourself down the road from having to pay for costly repairs.
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Step 3
Choose the right biological media. Different types of filters have different stuff inside to clean out your pond. Some have foam filters seeded with bacteria; others have beads or plastic media. Some may also include features like UV lights to help keep your pond at optimum health.
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Step 4
Find out if you can bury it. Some up-flow filters are designed to go underground for aesthetic purposes. If this is important to you, check whether it applies to the model you want.
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Step 5
Check the price tag. A good filter costs $200 or more, depending on its features, so shop around for the best deal.
