| 摘要 |
<p>PURPOSE:To enhance filtration capacity, by providing a bottom-part filter to the bottom of a water tank. CONSTITUTION:The inside of a water tank 1 is completely partitioned with a partition plate 5 and a bottom-part filter 3. Therefor since the amount of water in a pump side is constant, water pressure in total of both total water pressure charged on the cross-sectional area of small holes 14 and water pressure charged on the bottom of the water tank is caused in a water pressure generation place 6. Thereby the pressure is stored at the water pressure generation place 6 to apply pressure on all small holes 14 opened to the bottom-part filter 3. Therefore flow is hardly generated in the water tank 1 and natural environment (a lake) is presented. Thereby it becomes a breeding water tank wherein water as natural water is contained, and a fry or the like can be bred.</p> |
