2. Start the machine on a cloudy morning. The dissolved oxygen in cloudy water is low, usually starting at 3 o'clock. Start the machine in the middle of the night in rainy days, the photosynthesis of sunlight is insufficient during the day, and the dissolved oxygen in the water is low, so it needs to be started in the middle of the night.
3, found that the fish floating head immediately turned on, playing a life-saving role. Fish is opened every day in the peak season, and there are many materials in the peak season. Biological metabolism in water is active, and dissolved oxygen is high, so it needs to be turned on every day to increase oxygen.