Solar Sun Rings- put your heat back into your pool and keep it there, the most effective pool solar heating system! The Solar Sun Ring is a passive solar swimming pool heating device made from two sheets of heavyweight U.V. resistant vinyl. The upper clear layer holds insulating air and focuses sunlight on the blue colored lower layer. The blue layer absorbs about 50% of the sunlight and converts it to heat. The balance of the sunlight is allowed to pass through for deep water heating. Web site: www.solarsunrings.es Tel: 952 59 40 31