Higher living - te 'roiboos bio 40 filters By La Finestra Sul Cielo, a British company that for almost 20 years has been creating products and blending the best organic ingredients to prepare excellent teas and delicious infusions. All of their teas and infusions are carefully packaged in the rural Gloucestershire area, using fully recyclable packaging, for added freshness. It is recommended to boil 1 cup of cold water, let it cool for 1 minute before placing the filter. Leave to infuse for 2/5 minutes and sweeten to taste.