franng wrote: 現在每30秒一滴. 成個試水都係用缸內既水進行. 我自己就諗試到現在筒內D水既NO2, NO3都係零. 先會放落缸度. 唔知咁做有冇問題呢? 而且我諗D O2 會唔會過第三樽時已經減到最少呢?
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