One of the least favorite chores an RV'er must deal with is sanitation chemicals to the black water tank.  In the past this meant remembering to bring RV toilet chemicals, having to store RV sanitation chemicals and in many cases end up staining some part of the bathroom with heavily died sanitation products.  Many RV'ers use there trailers and motorhomes for short weekend getaways and end up wasting chemical due to the use of the new portion controlled packs intended for a full black tank. The Blue Streak Dispenser is a chemical injector that adds a metered amount of toilet chemical to the flush line of your RV's toilet. The t-valve is a venturi that creates a vacuum to draw the chemical from the reservoir and mixes it with the water as you flush your toilet.  So no power is required and installation in many cases takes 30 minutes or less.