Hello Roy,sorry to hear of your probs.The value of a good liner(butyl) was brought home to me years ago,on my first pond.Being amateurs and needing to get the pond up and running in a hurry as we had too many fish in a tank,we did not edge it very well.We started off with sand and limestone rocks balanced on the edge of the liner,sort of half and half with the grass.When the water got very hard and the pH rocketed,we swapped them for granite rocks.All seemed ok until one day when I was out we had a flood in the garden after a very heavy storm.I came home to find 2 very heavy rocks had slid in and hit the bottom.
Panic stations!! I could visualise the pond disappearing before my eyes.But no,i leaned in and got them out with some difficulty,and to my amazement they had not pierced the liner at all.
The funny ending to that story is that hubby had been away all week on a course.He arrived home,expecting me to greet him with welcoming,open arms.Instead one very wet,muddy and knackered wife saying ...hurry up get changed and give me a hand...............hmmmmmmmmm. ::) :o