SINQ was one of the first facilities to use specially developed optical guide systems to transport slow neutrons. Metal-coated glass conduits guide neutrons over longer distances (a few tens of metres) by means of total reflection, analogous to the light guidance in glass fibres, with a low loss of intensity. The efficiency of these neutron guides has steadily increased with advances in manufacturing technology. This is why PSI decided to carry out a comprehensive upgrade in 2019. When SINQ goes back into operation in summer 2020, it will be able to provide, on average, five times more neutrons for experiments, and in a special case, even 30 times more.