PO, I'm no expert on wells but I do know that well water is going to be really short on oxygen. You should be careful how fast you put it into a small pond. I would think you would want to set up a way to trickle water into the pond at a slow rate around the clock or install good aeration. What did Meadowlark tell you to get rid of filamentous algae? I'd sure like a tip on that.