A filter if you need one-has a big job to do. It will keep water clear and prevent your pumps from clogging with water-garden debris-fish waste, decayed organic matter, floating algae, leftover fish food, and many other unwanted tiny particles.
Not every garden pond that's home to both fish and plants will need a filter because a well-balanced ecosystem usually "cleans" itself sufficiently. If you can tolerate water that's less than clear, so can the plants and fish. But if the garden pond you are planning will be home to fish and not to plants, you'll have to install a filter to clean up after the fish.
The type of filter or filters-many gardeners use a combination-you'll need depends both on your tolerance for murky water and on the type of water feature you have. A wildlife pond should have a little algae, but water splashing in a white marble fountain must be crystal clear.
After planning the design of your water feature, consult with your water garden supplier to learn which of the following filters is best for your installation.
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