This is a pond I put in about 18 months ago. Two weeks ago, I noticed that the water level was going down, so removed the plants and bought a new liner, as it clearly had a puncture. Underneath were loads of mares tail, which I'm digging out and salting the area before rebuilding the pond. What I would like to know is, can this pesky plant actually puncture a pond lining, or is it more likely to have been caused by something else? Thanks, Paul.