Koi need to change water frequently, and the frequency of water change should be determined according to the state of koi. Usually, the water can be changed once every two to three days, one third of the water can be poured out each time, and then the new water is slowly poured into the tank along the wall of the tank to give the koi a time to adapt. If there are sundries in the fish tank, it is necessary to use the inverted siphon method to discharge the sundries. If the koi is in a sick state, it is necessary to increase the number of water changes, preferably every other day to avoid the second infection of koi.
koi a month without changing the water is not possible, usually a week need to change the water twice. If the water is tap water, you need to air the tap water before you can use it. Because tap water contains chlorine, chlorine is harmful to Koi, and chlorine can only be used for Koi after it is released. The purpose of drying is to release chlorine.
It is best to use old water to change water for Koi, because there are microorganisms in old water, which can promote the growth of Koi and increase their resistance. If the situation permits, you can use the old green water in the pond, after drying the old green water, you can use it. Every time you change the water, you don't need to change it all, you can change about one third of it.
