Reading around the site and pool school, the TFP method seems to focus on the 3 Bs. Bleach I have, Baking Soda I have, Borax is another matter. I live in the UK and the European Union recently classified Borax as toxic. Therefore it is not on sale to the general public. Only to trade and professionals. So are borates necessary for me to follow the TFP method? Are they required for me to get the FC level to minimum 3, target 5 for my pool?