This method is suitable for small fish ponds (generally suitable for fish ponds below 10 ton) and can basically improve the water quality.
Because the external filter is an auxiliary filtering device, it can't fundamentally solve the water quality problem of the fish pond, mainly because it can't solve the fish manure and garbage deposited in the fish pond. If these are not solved, then our fish pond will become the sedimentation tank of our regular filtration pond. Then those harmful substances will directly hurt our beloved fish!
If you use this method, you need manual care. Usually, you should strengthen the treatment of fish manure and garbage in fish ponds, and at the same time cooperate with nitrifying bacteria to degrade harmful substances in fish ponds!
The second is to build a fish pond filtration system in the existing fish pond.
This method is suitable for medium and large fish ponds. After the fish pond is completed, the water quality problem can be completely solved.
Because the filtration system in the existing fish pond will reduce the area and depth of the fish pond. When these two problems are solved, they can be implemented.
Third, a fish pond filtration system is being built around the fish pond.
This method is suitable for all fish ponds. After completion, it can solve the water quality problem of fish ponds.