Q1. Is it enough to use only water while cleaning or is it necessary to use any additional chemistries and/or saponifiers as well? A1. It depends on: * Flux residues that you're cleaning * Standoff of the components * Cleaning technology [we've never heard of 'supersonic cleaning'].
Q2. Where should the used water be pour out to? In Datasheet for paste and flux there is no information concernig the matter. A2. It depends if the output of your post-cleaning water purification process is acceptable to your PTO.
Consider: * IPC-AC-62A - Post-Solder Aqueous Cleaning Handbook * Your cleaning equipment suppler should be able to help you focus on the details of your concerns.
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