Originally Posted by
prestont
I could see how this sieve could overflow/fill up if a piece of any small trash (string algae, pine needle) were to catch in the float valve. No amount of buoyant pressure will stop the flow. And there still has to be the right level of water in order for the weir to work. If pond level is below the weir, no go. If pond level is high enough, the valve has to be perfectly tuned to the pump, and tuning like that frequently goes sour. This is a sexy, simple design, but it doesn't look like it would work at pond level, and if it was below pond level it would work until it got a small piece of trash in it, then it would overflow.