LifeStraw Personal Water Filter

I feel like it has come to a point where Woot! should just accept that they are the only seller of Life Straws and just dedicate an entire new page to it: Life Straw!

Does this method of water filtration need to be cleaned by back-flushing, or is there no back-flushing needed on this model?

I bought the inexpensive one for $15.00 at Bass Pro Shops.