．Wash sand and gravel bottom a the same time you make a water change-all in one, easy operation. Take the tedium out of cleaning your aquarium. No more scooping and rinsing of gravel and sand. 
．Unique valve lets you accurately control water flow-no sand or gravel will be sucked out with the guck that you remove when cleaning large or miniature tanks.
．Precision controls allow thorugh cleaning of bottom soil of aquatic plants without harming foreground grass or newly
sprouting plants. 
．Clean out decaying fertilizer the same time you make a water change to prevent algae growth. 
．Adjust length of vacuum cup to achieve maximum efficency.