I have trouble getting my Kefir to cleanly separate on a consistent basis, despite allowing it to sit out for multiple extra days, prior to refrigeration. As my house does not remain at the same temperature year round (nor day-to-day), I suspect temperature is a major contributor to the problem. I have tried heaters, and although I can get the room quite hot, the separation is minimal, just as without the heaters. Is there a special heater, etc. for this separation that would work for kefir cheese?