1st-direct understand that our customers need to have as much available information as possible to help them purchase the correct product for their swimming pool. 1st-direct's Product Sizing guide provides information on the right product for you to purchase for your size pool. This guide is based on a standard Hopper pool and gives a guideline to what minimal size is required. If you still need assistance on the right product to purchase please call us on 0800 328 4150.