The Sifter Screen Makes Composting Easier Than Ever. When Your Compost Is cooked, And Youre Ready To Empty The Barrel, Just Replace The Door With The Sifter Screen, There Are No Tools Needed.now Youre Ready To Sift Out The Smaller Particles. Just Turn The Drum Of Your 700 Litre Double Chamber Compostumbler And The Ine Particles Of Compost Fall Through The Screen Into Your Container Or Wheelbarrow. Its That Easy!