hi! If anyone has any advise to building a swimming pond about 60'x60'. I think we'll use a pond liner, maybe create a berm from the dugout ground and build a small pond there with lots of ferns and water plants, pump the water from the swimming pond to the small pond and then let it run down, in a small stream (with pond liner and pebbles) back to the swimming pond. We will hose the water in. Do you think that it will stay clean and not have algae blooms? Living on the border of Holland and Germany very near the River Rijn. www.bagelhole.org, www.vlierhof.nl