An on-demand system for intermittent high purity water production which by locating a storage tank for pre-polished water just prior to a final high purity polishing device reduces the potential for stagnant water in the system to reduce or degrade product high purity water quality and reduces the actual degradation of high purity water quality. A spring characteristic of the frame-shaped suspension may be improved by forming J-shaped structures which is formed by connecting an extension portion and an arc, on all corner portions of the frame-shaped suspension of the polygonal shape, whereby reducing variation in a vibration waveform and a resonance frequency when sensible vibration is generated. 45, or a melt flow rate of pellets regenerated from the filter cartridge is not lower than 5. In one embodiment, a separate guide member may be used to pull a dissolvable suture through the first catheter. Taking into account the over-erasure issue in the erasing operation, a programming operation is performed to precisely adjust the threshold voltage to a predetermined level of \u22122V to \u22121V. The base includes two pedals extending in opposite directions from the cylinder.