Bartlett Sand Filter Liners are manufactured from flexible Canvacon Q (260GSM Woven Polyethylene) fabric, carrying a 3 year UV warranty. Used as a part of a septic sand filter treatment system, Bartlett sand filter liners act as a critical barrier between effluents and the surrounding soil where a septic system is installed. For all new developments requiring a septic tank system, a Bartlett Canvacon Q Sand Liner filter may be required under the local municipality bylaws. Please check the exact requirements with your local council or permit conditions. All liners are made to order based on the dimensions of the pit they are being placed into. Please have the following dimensions ready when placing your order for a Bartlett sand filter liner; Sand filter pit width Sand filter pit length Sand filter pit depth Note: Bartlett sand filter liners are made to order and can attract lead times of 1-2 weeks for shipping.