Bathmat Hydro Rocket Douche just add water. Easy to assemble to use, simply remove the nozzle and fill the bulb with Luke warm water, replace the nozzle and the douche is now ready to use, easy to clean as well. The Bathmat Hydro Rocket is a personal hygiene device, designed to be used in the shower as a compliment to your personal cleaning routine. With an ergonomic, easy squeeze 10.98 ounces capacity bulb and innovative non-return valve to prevent water returning back to the bulb, thus eliminating any chance of contamination.