Ultra-Sieve 3 (Max Flow 4000GPH)How it works: Pond water will flow over the top of the auto adjustable dam (A). This dam is connected to the floater so its height is automatically adjusted. This system will provide that the exact amount of water that is pumped out the filter will enter the filter on the inlet. This has a number of big advantages in comparison with other sieve filters: Multiple, or bigger, inlets are possible (standard 2 x 110mm!). The upper edge of the UltraSieve