All Megna Pool swimming pool liners are made from vinyl purchased from the leading vinyl manufacturers. Their quality control testing includes computerized color monitoring as well as testing for dimensional stability and compliance with thickness specifications. Megna Pool liners are manufactured to stand up extremely well to the rigors of sunlight, moisture, and heat. A fungicide is also added to the vinyl to provide a backup to regular chlorination and algaecide treatment. In addition to the fungicide, a special clear top coat is applied over the print patterns onto the liner to maximize protection of the print against abrasion and reduce soil adhesion.