The Philips GC002 PerfectCare Pure anti-scale cartridges remove 99% of the lime and extend the life of your steam system by 5 times. Moreover, you also no longer suffer from dirt leaking water from the iron so that stains in your clothes belong to the past. The cartridges are specially designed for Philips PerfectCare Pure steam systems with Pure Steam technology. There are 2 cartridges in a package, with a single cartridge you can iron 3 months. So with the Philips GC002 Pure Steam anti-scale cartridge, you can be at least 6 months ahead.