@Henri, It’sbeen some time since I made Kefir. Pasteurizedmilk is ok, stay with the same type of milk if you want to repeat the processwith the same cultures otherwise they will need one run to adjust.
Important,never bring the Kefir cultures in touch with any metal, use plastic spoons and glass.The Ion flow will damage the cultures.
Best temperatureat 15° C - 25° C, if to warm the whey portion will rise, adding too manycultures to it cause the same effect, if to cold the Alcohol portion will rise.
Should be readyafter 30 hr – 48 hr. Alcohol portion of Kefir really depends on the length of fermentation.0.2 -2.0 % vol.
I don’tknow the type of Kefir cultures you have, I used Tibetan cultures 1 bulb Ø1,5cm to 400ml Milk.
It’s in anycase a delicious drink, good luck with it.