Liquid BriteVu can easily pass through a 27 gauge needle. If cooled below 37 C (98.6 F) or not properly mixed, liquid BriteVu will being to harden or form clumps. If this occurs, first make sure the total water volume is adequate (adjust for evaporation if needed) and heat the solution to 80-90 C (140-158 F) for at least 10 minutes.