To calculate the overall star rating and percentage breakdown by star, we do not use a simple average. Instead, our system considers things like how recent a review is and if the reviewer bought the item on Amazon. It also analyses reviews to verify trustworthiness.
These look awful, stick together and take forever to dissolve. They would perhaps be more useful for geolgy teachers who want to simulate the dissolution of minerals over geological timescales. Taste is bad, but could just be because they have no fizz.