Water Gardening: Bubble Rock - Converting a small pond to a bubble rock, 1 by HoosierGreen

HoosierGreen wrote:
I'd chosen a rock at the pond center, and paid them to drill the hole through it. It cost me only $15 for the rock, but $65 for drilling the hole. Any rock center usually can drill this hole for you.You can also buy rocks pre-drilled, but many are very expensive at garden centers (like hundreds of dollars!). I'd check rock supply places first. Be sure to specify the size of the hose you will be using!

This rock is called "sponge rock", and I believe it comes from Missouri. You might need to raise it up from the gravel by using some bricks or other rocks so that the hose won't kink when you set the rock upright.