Firestone PondGard EPDM Liner 25 × 30 ft · 45 mil is a Firestone-branded product in the ownkoi catalog. Larger-format Firestone PondGard EPDM liner in a 25 × 30-foot pre-cut sheet. 45-mil thickness, fish-safe certified, with the manufacturer-cited 20-year warranty. Specifications and pricing reflect the manufacturer-published or retailer-published data at the most recent catalog refresh. Verify the live listing on the source retailer page before purchase.