Ponds.
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.

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It will puncture through tarmac and concrete and landscape fabric not sure about your pond liner though.
Did you put an underlay underneath, old carpet or similar, if not it's possible it got punctured by a stone.
The marestail will just root it's way under the pond and head for the light it's almost impossible to get rid of it as. There are a few threads on here about it.
https://forum.gardenersworld.com/discussion/comment/2198903#Comment_2198903 is just one
You say salt is going to kill it. Once it's dead , it won't puncture anything surely?
There is certainly no call for such unpleasantness.
I would certainly like to apologise to @Hostafan1 if i contributed to such a nasty comment from the poster