The liquid whey is typically 30% protein at this point and can be spray dried to go into the food supply or can be filtered further to remove the remaining carbs and fats. These filtration processes pas the liquid whey through fine membranes that can produce a grade of whey protein that is over 90% protein and almost completely free from fats and carbs. The grades that range from 30% to 80% protein are called whey concentrates and the grades from 90% protein and above are referred to as whey isolates. Whey protein can also be hydrolysed which is a process by which the whey protein is pre-digested by a combination of enzymes which break the whole proteins into smaller fragments called peptide chains. These are digested even more quickly that the whole whey proteins and are becoming popular in supplements designed for specific recovery purposes. Generally speaking, the grades used in sports nutrition products range from the 50% protein whey concentrates up to the 90+% isolates.
I've used this protein before and been through 4, 2kg tubs. I'm using this as I'm getting back into my weight training after loosing weight, until reaching my goal. As an all round protein it is brilliant, it has all the amino's added as well as creatine with a good amount of protein, plus it mixes well and tastes great. I blend mine with a tray of ice cubes and a bit of water to create a thick milkshake style shake just without the added calories of milk! I only have 1 per day before my workout but this is usually joined with a tin of tuna in the day at some point giving good protein intake. Would and do recommend this to anyone, better than maximucsle and other big brands.