Arturs,
While interesting/intriguing, this seems like an awful lot of work for not a desired result. If anything, why not just age fresh water and transfer, or set-up a drip of fresh water.
Cleaning old water and trying to get it like new sounds like a tough task, unless you are from an area of the world where there is a water shortage or inability to get fresh clean water, this seems like a rigamoroe for no feasible benefit.
I would look into other options my friend...