This is a quote from the conclusion portion of the article I posted. Seems to imply the same thing. I’ve included some of my thoughts after
“I am less favorably inclined toward the value of its dialysis-based purification capability, despite the fact that this purification function appears to be the primary selling point advertised by Seavisions. The data support the conclusion that the Dialyseas can, in fact, deplete the aquarium water of undesired contaminants without causing ionic imbalances in other desirable water components. However, the concentrations of undesirable metabolites (ammonium, nitrate, nitrite, phosphate, etc.) that it removes are typically so low in a mature reef tank under standard operating conditions that the extra purification by the dialysis process seems, perhaps, to be overkill. On the other hand, the concurrent removal of desirable solutes, in particular calcium, seems like a big downside as it places added pressure on the calcium input devices (Dialyseas concentrated salt solution, Nilsen reactor, calcium reactor, others?) to keep up.”
However, I think this is still very interesting and could possibly be improved. Right now it appears this process is using only using RODI to diffuse contaminants across the dialysis membrane. If some sort of premade dialysate fluid was used similar how actual hemo dialysis is performed, you could remove harmful contaminants with out affecting beneficial ions.
There doesn’t seem to be enough interest in these machines tho to see any innovations, and it appears seavisions is basically a one man operation.
Also the individual cost of components used doesn’t seem to justify the overall cost of these machines. (The dialysis membrane is $59 dollars, the rest of the machine is an RODI and an analog controller and analog timer). The unit actually cost $3000.
However in its current form this machines use of salinity probe and supersaturated salt mixing does seem to show that a setup like
@Fenral ‘s DIY is absolutely viable for automated water changes