Our unique two-stage replacement shower filter uses a combination of copper-zinc oxidation media and coconut shell carbon to reduce 91% of the chlorine in your water. The filter also reduces organic chemicals and enhances p H balance. This means that you'll be able to enjoy the health and cosmetic benefits of showering in clean water, like reduced asthma symptoms and softer skin and hair. After six months, the effectiveness of your shower filter starts to drop, so be sure to replace the filters regularly. Aquasana shower filter cartridges last six months or 10,000 gallons, so a healthy shower can cost you as little as 25 cents per day when you choose Water for Life, our no-contract replacement filter auto-ship program.