The backbone of any water garden is a waterproof membrane. Although there are various types of membranes varying from rigid high density polyethylene (HDPE), fiberglass, flexible polyvinyl chloride (PVC) -- we at WLS have found that the most versatile & durable liners to be 45mil ethylene-propylene-diene-monomer (EPDM).
Firestone PondGard EPDM liner
High compression strength
Low Maintenance
Easy to install and repair
Low talc
Can be lined w/river rock & boulders
Highly flexible
High expansion and contraction tolerances
Resistance to harmful UV radiation
Fish safe! No mildew-resistant chemicals to harm fish