Quote Originally Posted by topz
Not sure your going to want to use that as a tank. The ph of the system will naturally lower and since the water just recirculates your going to built up more and more metals in your water. Not good for fish, plants, or you really. Just throwing it out there. Hope it helps.
X2 ^^^^^

You could line it with a pond liner or maybe find an epoxy coating. What did you have in mind PowerLink?