Clean Pottery

Hi, I have a similar problem with the calcium borate frit for one very similar glaze from the same book. I am trying to figure out how to substitute using glaze.org but really I am a beginner and don't fully understand yet. The recipe is as follows, and is the base glaze for Linda's runny transparent glaze that she adds various oxides to for different colour effects. Soda feldspar 47 Calcium Borate frit 16 Whiting 14 China clay 5 Quartz 18 I don't suppose there would be anyone to help me make the substitution with the frit, for any of Ferro frit 3124, ferro frit 3134, or Gillespie Borate. I can get all of these. Thank you in advance