Spa Fix A Leak is a blended, concetrated material designed to seal leaks in virtually any material. It can be applied to leaks in spa shells and works equally well in the plumbing lines. Marlig Fix A Leak will seal holes up to 1/8 inch in diameter and forms a permanent seal. This 8 oz. spa formula will work on smaller leaks in spas up to 1,000 gallons. If your spa is to be used without draining and refilling, Fix A Leak should not be used in excess of 1 qt. per 5,000 gallons of spa water.