NO. You can take out 1/4 or 1/3 of your system sand and replace it with pre-mulled Green Diamond, which will accelerate the conversion. Or, you can just stop adding your current system sand source and transition into our synthetic olivine. If you switch from natural Olivine, you will not see any difference in your system sand until you reach 50% Green Diamond sand. At that point, you should start to see an increase in permeability and cast performance. You can also start reducing the makeup sand as the insulating properties of Green Diamond sand reduce clay burnout so there is less contamination to dilute with new sand.