I presume Beutho’s system looks rather like a solution administration set with variable fluid and lock-off control:
It’s what I always use to acclimate fish or shrimps before introducing them into a tank with different water values, or simply to add fresh water that has a lower pH.
From my behalf, I’m wondering if it’s really necessary to prepare a tank to a pH of less than 6 when planning to buy new paro’s. In the LFS, they might have been kept in water with a pH of 7,2. Will the paro’s support such big change?