The Counting Test Facility (CTF) is the Borexino prototype detector built by the collaboration to test the large-scale purification of the liquid scintillator (LS) and shielding water from the natural radioactive isotopes. After achieving the record purification of liquid scintillator at the level of 10− 16g/g of U/Th, the CTF became the world’s biggest (about 4 tones of LS) low-threshold ultrapure detector. The data collected with an upgraded version of the CTF were analyzed by the Borexino collaboration in order to search for a number of possible manifestations of non-standard physics. A review of the main results on rare physics obtained recently using the CTF data will be presented, including limits on the solar neutrino magnetic moment, limits on the solar antineutrino flux, constraints on the electron e → ν + γ decay and nucleon/dinucleon disappearence, new limits on the non-Paulian transitions in 12C and 16O nuclei and, the result of searches for the heavy neutrino decay. These results demonstrate the sensitivity level of a modern lowbackground low-treshold liquid scintillator detector. The full-scale 300 tones Borexino detector will approach limits of great theoretical importance for some of the cited processes.