Posted: 05/10/2013 at 12:11
thanks for all the comments about my pond. It is definately a gas that's inside the lining that's coming up. I've got an old pair of waders and sometimes go in the pond and trample the liner down ( when no-ones watching) and big bubbles of gas come up. I think we may have constructed the pond wrongly.
We did it as cheaply as possible and bought a roll of polythene that farmers wrap those big bales in. We put a layer of that in first then did lots of runs to the recycling dump and got loads of old carpets,then another layer of liner on top. that's probably where we've gone wrong trapping the carpets in between the liner.
This winter I intend to put lots of soil in the bottom and hopefully that will help.