Has anyone in this group used the AP tap water filter to make deionized water? I'm using my first cartridge (to make water for licorice and sparkling gouramis) and I'm seeing color changes unlike those described in the manual. Also I'm seeing bands of yellowish pink at the middle and at the top of the cartridge. I suppose I could just replace the cartridge but I'm curious if this is the typical color change. The manual describes a color change from green to blue-violet and a cartridge change when the color change has progressed to the top of the column. I still have large areas of the original color but a very thin band of the yellowish-pink at the very top. Thoughts? Betty Goetz _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member