Do you have a picture are you sure it is in fact a pond snail?
So I have this 15g column set up on my desk at work, it's nice to have, very calming. Over the past few weeks I have been watching my snail population
I did this pond for a customer several years ago. The interior of the pond was tiered with a couple plant shelves.
I'd go with a firestone rubber liner...very tough and easy to work with.
For filtration I'd DIY one with a 30 gallon plastic barrel. Place