PermaGuard Solid Vinyl Rectangular Safety Pool Cover 18 x 36 Feet, 4 x 6 Center Step With Drain gallons per minute_100 124 This kit enables indoor installations This kit enables indoor installations where the exhaust vent pipe termination is required to be vertically terminated a minimum of 3 feet above the roof and a minimum of 2 feet above any portion of a building within 10 feet horizontally This is a 30 Gallon Gray Chemical Tank System with 45MPHP2 Model Fixed Flow Pump almost 1 3 lighter than other vinyl materials The opaque vinyl material blocks out sunlight which may contribute to the formation of visible algae in the absence of preventative chemicals