Continuous water changes

[Pescador]

Is anyone doing this on their systems?
I like the idea of mixing 50g and have it change slowly over the course of a month.
From RHF article here
Water changes in reef aquaria

These changes are slightly less efficient than single batch water changes of the same total volume. A continuous water change of 30% exactly matches one batch 26% water change. As with very small batch water changes, these have the advantage of neither stressing the organisms (assuming the change is done reasonably slowly), nor altering the water level in the aquarium.

The price for a Litermeter and remote pump or Reefiller seems like the biggest drawback unless there are some cheaper options.