To the exact amount
It’s nice that we’re looking at an example of a product being so literal and precise that it’s down to the decimal point in terms of what it recommends for refilling. We say this because so many companies fail to provide such information to their customers.
With that said, we’re not sure how many people understand what a 2.8 refill is because we wouldn’t know. It’s still nice that the manufacturer attempted to be as clear as possible about refilling.