There a 4 big advantages to using the ShowerStick. 1. The KDF Chlorine Filter is made of a copper & zinc alloy. This enables it to be smaller and last much longer than a Charcoal Filter. 2. The ShowerStick does not have to be removed and disassembled to be regenerated. The ShowerStick remains in place and the regeneration procedure takes less than one minute by removing the 1/2" plug to add the salt solution. 3. Our system is made of thicker and stronger Sch 40 PVC plastic for longer life and is practically indestructable. 4. We have a 14 day return policy if you are dissatisified for any reason and a one year warranty.