Christal Pools - the longest established manufacturers of liner pools in Europe, the extreme simplicity of construction of our Double Bubble Pools results in a dramatically lower cost than that of any other pool. The Double Bubble is a unique design, which serves so well that there are now many such pools in existence which are over 30 years old. These pools can be and are installed in any location indoors or out, above or in-ground on hillsides or rooftops and the attractive shape contributes to long liner life and excellent filtered water movement. The pools can be flat bottomed or incorporate a divewell at one end. For our full range of Pool sizes & dimensions please click here.