You can let the tank go for awhile and not dose to purge any excesses that might have built up over a month or two or you can test to see rather than do the water change.
过一段时间后养料可以不用添加，因为前期可能有过量营养积累在缸中，此时不用管，也不需要换水。
Pilot-scale test was conducted on the secondary micro-flocculation of water from sedimentation tank for improvement of filtration efficiency.
为改善过滤效果，开展了沉后水的二次微絮凝过滤中试研究。
Model BQJ-1 Semi-automatic Water-bath Test Tank for Aerosol Cans Capacity:Counted by each can immersion in water for two minutes.
BQJ-1型半自动气雾剂水浴检测槽 生产能力：以每罐在水中浸泡三分钟计算。
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