I mixed a medium batch that is 7 parts coco coir (double buffered, CaliMag), 2 parts perlite, and 2 parts worm castings. I did a slurry test and the pH=6.7 PPM=779 EC=1.65 TDS=968. I'd like to lower these numbers across the board before I plant into this mix. Does anybody have any idea how to do...