Using magnetic rods, simple magnetic grates may be created. Using screws, screw the magnetic rods onto a load-bearing frame. Due to a very thin covering pipe wall, the resulting magnetic force on the magnetic rod surface is 6,300 and 8,900 Gs!  Magnetic rods may be inserted into the stainless-steel pipes. This way their cleaning becomes simpler but, on the other hand, the magnetic force decreases.