Since our previous "wiper" is now slowly getting on in years, a new was needed! The choice fell on the JBL as he has promised us the size. Delivery was like (almost) always great, kudos to Amazon! Zack - put into operation - ooooh you! As has "our age" performs better services! Can greatly serve the wrong one here nothing, which is why I'm really disappointed! The cleaner leaves much to be desired. Real shame, now the old hangs back in the pool! But he has something good - the inner part, which dissolves already now and then a clean, high floats!