Lo-Chlor Swimming Pool Leak Sealer – Pool Plumbing Sealant. Leak Sealer Is Specifically Designed To Seal Minor Leaks In Swimming Pools. If You Have A Leak, Then This Product Is Should Be Your First Option Prior To Spending Excessive Amounts On Leak Detection And Possible Major Structural Work. Leak Sealer Is Designed To Be Used With A Water Loss Rate Not Exceeding 1 Inch Per Day In A 60,000 Litre Pool. For Leaks In Spas Or Hot Tubs Please Go To Our Dedicated Spa Leak Sealer.