Fish cannot be raised directly in tap water, because disinfectants will remain in tap water after disinfection, and tap water contains residual chlorine, which can cause hypoxia, discomfort, and even death of some fish. If you want to use tap water to raise fish, you can leave the tap water in the air for a period of time to allow the residual chlorine in the water to evaporate in the air before using it to raise fish.

Methods for water treatment in tap water fish farming:

1. Sun exposure. Exposing the water to the sun for a day is an energy-saving and environmentally friendly method that can also increase the temperature of the water.

2. Let it sit for a few days. In the absence of light, the water can be left naturally for 7-8 days. The lid of the tap water container must be open.

3. Activated carbon filtration. Filter tap water with activated carbon. Activated carbon can absorb dirt in the water.

4. Use large soda. You can add a small amount of soda to tap water to neutralize the free chlorine in the water.

5. Add nitrifying bacteria. Adding nitrifying bacteria to the water to clean the water in the fish tank can also remove chlorine from the water.