SALTWATER AQUARIUM FILTRATION
This type of filter provides mechanical, chemical, and biological filtration and they are particularly useful for aquariums that are 40 gallons in capacity or larger. Canister filters are multipurpose filters that may be used in conjunction with supplementary filtration equipment or they can work well as the sole filtration device in a saltwater aquarium. A canister filter consists of a plastic housing, or canister, that contains various types of filter media. A siphon tube draws water from the aquarium into the canister, forcing it through the filter media and back into the tank through a flexible pipe. As water is forced through filter media, solid debris is caught and dissolved wastes are filtered out of the water. Biological filtration media inside the filter give beneficial bacteria a surface on which to grow and reproduce.
A fluidized bed filter differs from canister filters and wet/dry filters in several ways. The most notable difference is the fact that these filters hang on the back of the tank. Fluidized bed filters work by pumping tank water into the filter, forcing it up through filter media consisting of sand, silica chips, or plastic. In order to facilitate filtration, you will probably need to buy a separate power filter or pump – most fluidized bed filters do not come with one. The benefit of this type of filter is that it provides great surface area for beneficial bacteria to grow. A downside is that the sand will eventually compact which will restrict airflow and it could reduce oxygen levels in the tank. Another downside is the fact that chemical filtration typically doesn’t work well with a fluidized bed filter.
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