That's a good idea. Have you ever used the portable unit? I really only need to mix about 10g. How long would it take to make this much? If it was a quick connect, fill 10g and disconnect I would seriously consider this. At the moment I'm taking 2 liters of water from the drinking water filter at work to fill my 5g salt bucket or my 33 liter (roughly 13g) plastic storage container for water changes. It's literally an all day task. I don't think I'd get any. Complaints if I hooked it up for about 5-10 min in the bathroom and filled it up after office hours.
This is a similar model filter I use at work:
Although I really don't know if the model at work uses an RO
filter. In this model pictured does anyone see any potential problems with the filtration? I guess I'm playing Russian roulette here but I havent done any extensive water testing, everything in my tank looks fine and healthy. I had some ich on two of my fish but after a partial water change it cleared up in a few days, with significant improvement in the first 24 hours.