A small RO system is next on my list, for the grow and for drinking, since spring water is $1.79 a gallon. I suppose it takes a couple of hours to run 10 gallons of RO water for a batch of nutes? I'm gonna have to figure out a way to shut it off automatically because I certainly won't remember.
It is totally worth the investment. I was carting jugs of RO/distilled from the store and the price creep was worth it very quickly. The RO buddy on Amazon from Aquatic Life is inexpensive and easy to use/setup. There is a 50, 75, and 100gpd version. The 75/100 look almost identical and I don't think they are different. Mine takes about 14min/gallon depending if anyone else is using water.
I highly recommend hooking it up behind a toilet as the conections there are pretty easy to connect and have a shutoff valve in case of leaks, F-ups, etc. The RO buddy uses 1/4" water lines. There is an angle stop valve diverter available at HD.
John Guest 1/4” Angle Stop Valve (ASVPP1LFD)
The larger systems 75/100 come with a float valve shutoff attachment. Several ways to plumb in the system if you decide to fill a bucket. Having a drain for the runoff is important. They unfortunately run a 1:3 ratio of RO to waste. There are better less wasteful systems but the price increase reflects that.
I usually just set a timer on my phone so I don't forget to turn it off.