Firestone PondGuard rubber liners are the industry standard when it comes to pond liners. PondGuard is made especially for ponds and water gardens with no algaecides or fire retardants like found in most EPDM roofing liners. PondGuard is guaranteed not leach any harmful chemicals into your pond like some cheaper liners. In addition, the liner is very UV resistant, and no covering of the liner is required below water level if desired.
The main advantage of in general is it's flexibility. If your pond has many corners, bends or shelves, EPDM is able to bend and fold to pretty much any shape. It is also quite temperature and weather resistant, tested to withstand temperatures as cold as -40 degrees Fahrenheit and as hot as 175.
Firestone guarantees the PondGuard EPDM rubber liners for 20 years as long as the liner is installed as per manufacturer recommendations. One such recommendation is the use of an appropriate underlay underneath the liner to help increase the puncture resistance of the liner.
Guaranteed for 20 years!
Ozone resistant; will not blister, crack, or deteriorate in direct sunlight.