Catit Magic Blue Refill Pads. Catit Magic Blue is safe, easy, non-toxic and unscented. The Catit Magic Blue Refill Filter pads are to be used with the Catit Magic Blue Cartridge to successfully reduce hazardous ammonia gases up to 80% and fecal odors by an average of 40%. The Catit Magic Blue Refill Filter pads include 6 pads (3 months supply). The Catit Magic Blue Cartridge is available separately. Reduces hazardous ammonia gases for a safe and cat-friendly litter box Unscented and non-toxic Includes 6 filter pads (for 3 months) Made of BPA-Free Materials