Under normal circumstances, how to open the aerator is clear at a glance. If there is no tool for measuring dissolved oxygen, you can refer to the following points.

Start-up principle:
One, oxygenation at night. According to the actual situation, the aerator (pure aerator or traditional impeller) should be operated from night to two hours after sunrise, when the respiration and photosynthesis of the water layer are roughly balanced. As for when to start the machine at night, you need to judge by yourself according to the actual water quality trend of the fish pond.
Second, the high dissolved oxygen stirs the water. There is excess dissolved oxygen at the peak of photosynthesis during the day. If it is not fully utilized, it will slowly escape to the air. It is not necessary to use a pure water mixer or a traditional impeller to strengthen vertical convection, which can stir the sludge to oxidize the bottom. The start-up time is generally around 12:00 to 16:00 when the dissolved oxygen peaks.
Third, low dissolved oxygen oxygenation. This is obviously easy to see. In the case of weak photosynthesis or poor water quality, try to turn on the pure aerator.
Do not start the principle:
First, do not turn on the water mixer during the low oxygen period to avoid stirring the sludge.
Second, if the pure aerator is not turned on during the high oxygen period, it is a waste of electricity.
Dissolved oxygen depends on both experience and science. It is strongly recommended to install dissolved oxygen detection equipment.
Rumor 1: Although the saturated dissolved oxygen value of pure water at 25 degrees Celsius in the laboratory is 8.25, the phenomenon of dissolved oxygen supersaturation often occurs in ponds with strong photosynthesis, and more than 10 is very common.
Rumor 2: agitation will not cause the dissolved oxygen in the water to quickly escape to the air, but only aggravate the respiration (oxidation) of the fish pond and consume the dissolved oxygen. Generally speaking, it is a good thing to reduce the oxygen debt, but if the trend is that the dissolved oxygen is not enough for the fish When used with shrimp, that's a bad thing. Debt repayment is still within our means.