Carefully position liner with gusset line centered in reservoir (giving the appearance of two equal cross sections). Never allow Garden Armor to come into contact with submersible pump impellers. Always use your pumps protective guards to ensure that you do not compromise the liners integrity; One hole and the product becomes defective. When utilized properly, you will celebrate the full benefit of Garden Armor. Improperly, you could end up with an all too familiar mess on your hands!