Editorial Review Our pond under layment (underliner) is a tough, thick, nonwoven 60 mil geotextile fabric that will protect your liner from any sharp rocks, glass and even against burrowing animals that can damage a liner. Lightweight and easy to use, we recommend and use this thick nonwoven, geotextile underlayment with every pond installation we do. Pond underliner fabric provides insurance for your liner against glass, sharp stones or roots that may have been overlooked during the installation process. Don't take a chance with the backbone of your pond! 300 sq. ft. Underlayment increases puncture resistance by 415% compared to pond liner alone!
Features 1) Protects your liner from any sharp rocks, glass, even against burrowing animals 2) Lightweight and easy to use 3) We recommend and use this underlayment with every pond installation we do 4) Underlayment increases puncture resistance by 415% compared to pond liner alone