| 摘要 |
<p>PURPOSE:To prevent the aerobe or the fish kept in a water vessel from being deficient in oxygen by previously detecting the supply of air necessary to purify water. CONSTITUTION:A water force-feeding means 4, a microbe culturing module 6 and a means 5 for supplying air to the module 6 are successively provided to a passage for forcedly circulating the water in a water vessel. Besides, a means 16 for changing the flow rate of the water flowing in the forced circulating pipe, the air current detecting means 12 and auxiliary air supply means 11 respectively provided at the air inlet of the air supply means 5 and a circulating flow rate variable control part 22 are also furnished.</p> |
