Understanding Aquarium Filtration

Ideally, an aquarium filter should include three types of filtration: mechanical, biological, and chemical. Here's how each of these works and why they are essential:

Mechanical Filtration

Our FilterFirst filter pad serves as a mechanical filter. Its primary purpose is to trap free-floating debris from the water, which must then be removed to prevent it from breaking down. Typically, our FilterFirst pad can be rinsed weekly and replaced monthly. That said, the frequency of cleaning or replacement depends on the fish load in your aquarium.

Biological Filtration

During the cycling process, beneficial bacteria establish themselves in your aquarium. These bacteria include:

• Nitrosomonas: Converts toxic ammonia into nitrite.

• Nitrobacter: Converts nitrite into nitrate.

• Anaerobic Bacteria: Reduces nitrate, which can then be controlled through water changes, live plants, or algae.

These beneficial bacteria colonize on surfaces in your aquarium, including the aquarium sides, decorations, filter tubes, and biological filter media. If you are only using a mechanical filter and replace the mechanical media entirely, some beneficial bacteria will be lost. That is why biological media such as our BioLodge or ceramic rings are vital. Biological media provide ample surface area for bacteria to grow and colonize, ensuring stability – especially when the mechanical filter media is replaced. While biological media typically do not need replacement, you can rinse this media in aquarium water or dechlorinated water if necessary.

Chemical Filtration

Activated carbon is a common example of chemical media. It removes organics and impurities from the water.

Maintaining Your Aquarium

When changing a FilterFirst pad, you should not see your aquarium re-cycle. To ensure this, you can test your water for ammonia and nitrite. If you have established biological media, you might notice small traces of ammonia or nitrite, but the beneficial bacteria should quickly handle these levels.

For new tanks, it takes about 4 to 6 weeks to establish sufficient beneficial bacteria. During this time, monitor the cycle with an aquarium test kit. To start the cycling process, you will need fish or ammonium chloride to introduce ammonia for the bacteria to process.

I hope this guide helps clarify the essentials of aquarium filtration. By incorporating mechanical, biological, and chemical filtration, you can maintain a healthy and thriving aquatic environment for your fish and plants.