Spa Solar Sun Ring
The Spa Solar Sun Ring is a passive solar spa 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. Spa Ring fits 68 to 102 inches. One size fits all spas.