WIT :: Cell Safe Anti-Scale Hard Water Filter - ULTRA UPGRADE w/ 20% More Media!Stop hard water mineral buildup such as calcium carbonate (lime scale) from ruining your Ionizer and reducing its effectiveness with Cell Safe ()! Cell Safe () is an inline filter that helps eliminate scale build up. It is very easy to conceal and does not require a canister housing. This composite pre filter not only prevents scaling, but it actually eliminates scale build up, thereby improving the health and longevity of your Ionizer. If you have