We used all the existing systems except electrical systems and this is the most effective and the most economical. Yes there is no filter but at least it frankly sucks (4 to 5 times more effective than those with ProRhinel filter type) so it's faster and our daughter suddenly Chouine shorter. The mini-sprinklers can effectively clean and the end that inserts into the nose is very flexible, so non-offensive if a little "big". I highly recommend it.
