The Water Cube by Stadler Form ensures optimal hygiene in your humidifier. Using the Water Cube leads to flawless operation of the humidifier and extends the lifespan of the device. The Water Cube also works when the device is turned off, keeping the humidifier fresh for an entire season. We recommend replacing the Water Cube at the beginning of each humidifier season. It is the original accessory for all Stadler Form humidifiers and air washers. The Water Cube replaces the previous Silver Cube from Stadler Form.