Filter bags are ideal for holding filter media such as activated carbon and zeolite, or products such as barley straw and oyster shells. Durable and efficient, a filter bag is a great accessory for any pond keeper.
Filter bags are mesh bags that have large enough holes to allow water to get in but small enough holes to stop any of the media from getting out. The bags are loose so they allow water to surround each piece of filter media for maximum filter surface area.
When teamed up with powerful filter media, filter bags allow for the most effective filtration while protecting your pump and pond filter from escaping chunks of filter media. This means that they will make your pond cleaner and safer for all of your pond life.
Each filter bag allows a different amount of water to pass through and is better designed for a particular size of filter media, ensure that the bag you buy is the right size for the filter media you want to use. Past that there's little difference in the filter bag range.
Focus on finding the right bag for the filter media you want to use, past that it's mostly about choosing a brand that you trust, and possibly a bag with a design you prefer.