The Tank Caddy: Soot Trap for Blue & Bleach Toilet Tablets - Extends Tablet Life by 30% & Protects Toilet Parts, which saves you money! Simply hang the carrier inside your toilet's tank and drop in your favorite tablet. No longer will you have to accept the sludge and potential damage to your toilet parts that comes with dropping disinfectant tablets directly into your toilet tank. It's patented design includes a reservoir that traps the sludge disinfectant tablets leave behind as they dissolve while front facing vents release disinfectant into your tank (the caddy also extends the life of your tablet up to 30% by oversaturating the water inside The Tank Caddy, thus reducing the amount of disinfectant absorbed). Important: The Tank Caddy only fits toilet tanks with standard water levels and is not made for toilet tanks with low water levels. (Ideal toilet tank water levels, when full, should measure approximately 6 inches or less from reaching the top of the toilet tank).