Hello all, I am New to ponding and still in the planning stages of my pond. Due to size of space, my pond will roughly be 9x14x3. I have already bought two 55 gallon barrels (mechanical & bio) and an Elite brand external pump.... my filter will also lead into a bog type system for water gardening which will also discharge back into pond. My focus right now is on which liner to buy. I was almost set on firestone epdm, until I ran across a rpe liner that appears to be stronger.. I am welcoming all suggestions and personal experience.. FYI my pond will have a couple of koi too.