Fix A Leak is a blended concetrate designed to seal leaks in virtually any material. It can be applied for leaks in spa and pool shells, but works equally well in the plumbing lines. Marlig Fix A Leak will seal holes up to one-eighth inch in diameter and forms a permanent seal. One quart formula will work on smaller leaks in spas and pools up to 22,000 gallons. If your spa or pool is to be used without draining and refilling, Fix A Leak should not be used in excess of one quart per 5,000 gallons of water.