Thanks Jeff, yeah we are already sitting and enjoying the sound of water already. Very relaxing. I got my viastone rocks online from the home depot website. We are in a rural area so finding a place that sold any clay rocks was almost impossible. Home depot was one of the cheapest prices ($29 for 50 liter bag) I could find online, plus, buying more thatn $45 worth gave it free shipping to my house! All other online sources I could find were around the same price or a little higher but they charged shipping, and for packages that big, it was high prices. So it worked out nicely for me. Good idea on a second system, I am already contemplating how to add on to mine.