The first is physical filtration, which can suck suspended particles in the water into the filter pool, thus keeping the water clear.

The second is biological filtration, which can transform ammonia nitrogen and avoid poisoning fish by cultivating a large number of nitrifying bacteria.

There is also chemical filtration, such as using algaecide to prevent and destroy algae.

First, how to filter the fish tank and clean the fish tank. In order to ensure clean filtration, you must prepare various filtration methods.

The first is physical filtration, which can suck suspended particles in the water into the filter pool, thus keeping the water clear.

The second is biological filtration, which can transform ammonia nitrogen and avoid poisoning fish by cultivating a large number of nitrifying bacteria.

There is also chemical filtration, such as using algaecide to prevent and destroy algae.

2. What are the filtering methods? 1. Physical filtration: Physical filtration is an essential filtration method, which can suck suspended particles in water, especially broken fish food and feces, which will pollute the water and make the water look turbid. Filtering can bring it into the filter tank, thus making the fish tank look more transparent.

2. Chemical filtration: Chemical filtration mainly uses various chemical reagents, some of which can adsorb particles and some can destroy algae. It should be noted that different reagents cannot be mixed, otherwise it may lead to its failure.

In addition, we should pay attention to the dosage to avoid excessive poisoning of fish.

3. Biological filtration: The way of biological filtration is to eliminate some invisible harmful substances in water through beneficial bacteria.

For example, nitrifying bacteria can convert ammonia nitrogen produced by manure decomposition into nitrate, thus avoiding poisoning fish.