Unimed-Midwest, Inc. Bleach Cartridge Refill, 11 oz. Bleach sprayer automatically mixes a precise 10 percent bleach solution every time someone squeezes the trigger. Works by keeping bleach and water in separate cartridges until time of use. Bleach comes in cartridges, so nobody has to handle bleach at any time. Water cartridge easily refills at the faucet.