There are 2 types of filters that you can choose to apply to dry fish pond, namely mechanical filters and biological filters. Mechanical filters work by flowing water into a container in which there is a filter media such as napkins, gravel, sand, sieve filters, jap-matt, foam or foam, cotton, or brush material. A biological filter for working other living things that decompose dirt in a koi pond. Living things that can be used as filter media are water hyacinths or other plant filters, such as water jasmine, Tifa, umbrellas, and butterfly leaf water plants.
This stage requires precision and careful calculations so that the resulting pool is following the design design. The ideal koi pond depth is 1 meter for koi measuring less than 30 cm, while for koi measuring between 30-40 cm, the ideal pool depth is 1 meter to 1.5 meters, and for koi measuring more than 40 cm the depth of the pool should be more than 1,5 meters. Also, determining this size must pay attention to the fish population that will follow the pond. Too little population causes fish difficulty in finding food. The behavior, too much causes fish to fight for food and oxygen. The ideal population can count with a koi fish that can be 3 times its body size.
To facilitate the process of building a koi pond, make a plan with detailed measurements according to the calculations that have been carried out, also considering the design of the fish pond you choose. This is done to avoid mismatching the size of the koi pond in the manufacturing process. The construction of a koi pond goes through 3 stages of the manufacturing process. The criteria for resistance to the excavation of the soil, casting, and bricklaying, and finally are plastering or plastering of the pond. In the first process, excavation is carried out based on the previously calculated size. The thing to pay attention to at this stage is not to let groundwater gush and wet the dugout. If the air has burst out even though the excavation has not reached the proper depth, then the air must be sucked in with a pump to keep it dry and facilitate the next process.