Leak Sealer Leak Sealer Lo-Chlor This fast-acting product will seal minor leaks in most swimming pools and spas in just 24 hours! Leak Sealer can seal leaks losing up to 1″ of water per day without even having to drain the pool or spa water. Continue Search Chemicals by Brand Pool Chemicals Spa Chemicals See Also: Nix Ultra Zyme Chlor-Nix