Because of the performance. Information on the year of 57/58 The maximum available pressure pot pressure leaf filter = 3.5 kg/cm 2. Thus, the current verification so that such pressure, but does not save the test pressure.
Since the operation Data usage in 57/58. Maximum pressure on the filter pressure leaf = 3.5 kg. / Cm 2, so verification is made that such pressure. But not recording the pressure test.
Since the performance data applications in 57 / 58. Maximum pressure active filter pressure leaf = 3.5 kg. / cm 2 so verification thus do pressure mentioned. But didn't record the pressure test