Biological filters help remove suspended particles like ammonia and nitrates from the water, making the water cleaner and safer for all living things. Biological filters use beneficial bacteria to break down organic contaminants in the water. These filters are usually equipped with an air pump that draws oxygen-rich water into the filter media, bringing it into contact with the beneficial bacteria.
Mechanical filters (also called skimmers) are great for removing larger debris, such as leaves or twigs, from your pool or pond water. Mechanical filters work by trapping larger debris in some kind of media. This media can be a skimmer basket, which collects leaves and debris like a pool skimmer. Some mechanical filters also use sponges or other porous materials. As the water flows through this media, any particles larger than its pores become trapped inside.
Factors to consider：
1. Water feature size: The size of your water feature determines the size of the filter you need. For larger water features, you may need to use a combination of a biological filter and a mechanical filter.
2. Water flow rate: Biological filters require a certain amount of water flow to work effectively. Make sure the pump is powerful enough to provide adequate water flow.
3. Budget: The initial cost of a biological filter may be higher than a mechanical filter. However, biological filters are lower maintenance and more cost-effective in the long run.
4. Aquatic life: If you have fish or other aquatic life in your water feature, a biological filter may be a better choice. These filters create a natural and healthy environment for your aquatic pets.
