Yes, that would be the buffer used by the company who made it. Unless you got the brick form, you may have to leach until the ppms drop and then buffer the medium with calmag your self.Hey everyone - I just switched from soil to Gold Label coco. I wanted to test the medium, so I poured some plain water through a 1-gal pot filled with brand new coco. The runoff was 200 PPM higher than the water that was poured in. This is BRAND NEW coco. Is that normal? Thanks!