The EPDM Rubber pond liner from Gordon Low is perfectly compatible with aquatic life and carries a 20 year guarantee. This can be easily shaped to fit any pond shape and is robust enough to prevent any leakages. In the unlikely event of a puncture this great material can easily be repaired on site with a self adhesive quick seam joint cover patch. Pond Guard liners such as this Firestone EPDM display outstanding resistance to UV exposure, ozone, frost, snow and extreme temperatures. Developed to protect against microbial attacks and algae growth, Firestone liners with Pond Gard contain no migrating plasticizers which means no cracking or splitting. This means twenty years after installation, many water features built with PondGard Rubber Liner are as functional and beautiful as the day they were installed. This Pond Liner is sold by the metre, it is 3.66m wide and 1mm thick. Lining Tips. For the liners maximum length, measure the longest maximum length across the pond, add to this TWICE the maximum pond depth, then add another 2 feet minimum or 60cm. For the liners maximum width, simply do this the other way so measure the maximum width of the pond, add to this TWICE the maximum pond depth, the add another 2ft or 60cm.