The Kalita Wave is a unique brewing process with tailor-made filters and brewers that provide foolproof pour over coffee extractions. The inside of a brewer features a wave design with a contrasting 20-wave filter that works rhythmically together to limit contact between each other so water can flow evenly and at just the right rate. Once the water reaches the flat bottom 3-hole design the brewer prevents water from accumulating so extractions are even and bitterness is dodged; the result is delicious coffee. Rarely are people disappointed with the results of a Kalita Wave Brewer for their even extractions and simple brewing process.