Put 1.5 kg of salt into a ton of water in the fish pond. Salt is added to the fish pond for sterilization, and salt has a certain bactericidal effect. For most fish, putting some salt in the water can prevent diseases and have a certain therapeutic effect in the early stage of fish diseases.

Alkali removal methods in fish ponds:

1, vinegar bubble method: fill the cement pool with clean water and add vinegar to the pool water. Add 0.5 kg vinegar per cubic meter of water. After soaking 1 to 2 days, drain the water, brush the cement pool and inject new water.

2. Calcium superphosphate method: fill the cement pool with clear water, and add calcium superphosphate or acid sodium phosphate and phosphoric acid to the pool water. The dosage is per cubic meter of water 1 kg of calcium superphosphate, 20g of acidic sodium phosphate or 250g of phosphoric acid. After soaking for two days, drain the water, brush the cement pool and inject new water.

3. Glacial acetic acid method: use 10% glacial acetic acid to clean the bottom and wall of the newly-built cement pool, then fill it with water and soak it for 3 to 5 days, then drain the water, then brush the cement pool and replace it with new water.