I have tankless hot water on demand system- why when draining hot water tank do I get so much water out ? it must have a tank. also how do you add Clorox to water system with hookup on out side where you hook hose up? also does anyone know if there is a alturnitave plastic polish & cleaner, I can't afford plexus at $19.00 a can, have tried a couple others but they seem to be greasy or leave a scum thank you I some one will come through. dabrown