LIB Chlorine Leak Indicator Bottles are designed to use with the supplied aqua ammonia (shipped separately) to use to identify leaks in chlorine containers from the reaction of the chlorine and ammonia vapors. Kit Includes: 1pc.  16oz Wash Bottle 5pcs. Cotton Swabs Instructions and MSDS 1 pc.  16oz Aqua Ammonia (shipped separately-HAZMAT charges apply) 26° baume (28-30%)   *Household ammonia in comparison is typically 16°baume or 10% Ammonia has a two year shelf-life