tyw if you had read my original you would know that my pond is all spring fed. The springs supplying this pond are all very cold aprox 45degress , they most come from deep under ground trough a shale slate stratum . I always wanted to investigate these springs to see if i could increase there flow somehow. Unfortunately i never had the time to do it. IN any event the springs feed the pond with a total flow of perhaps 60gal per min....its all in my original posting ,you should read it, its still there! anyway i included pictures of my pond you can get alot from them .They are a couple of posts back from this one. i appreciate all the suggestions and comments and find them all interesting!