We have a Spectra Newport
Magdrive 2005, equipped with a Z-Brane.
Our experience with the Z-brane is HIGH cost, no effect.
The best way to "maintain" your water maker is to run it very often, daily if possible.
The Z-brane is expensive, requires to drill a hole in the membrane side cap (unless you buy the membrance directly from Spectra at an astronomical price). The high voltage can cause a spark that deteriorated the water maker body end cap. Spectra doesn'tmake this endcap anymore, so we had to get one made ($$).
Assuming that the Z-brane works (which we seriously doubt), turning it off would - maybe - force us to replace the membrance more frequently. Now a new membrane cost $140 and takes about 1/2 to replace !!!
Maintaining our Z-brane has cost us in excess of $1,500 so far.
: excellent Z-Brane, like new