Please don't yell at me Tony, but ofted not to do the reservior. I just can't bring myself to fill one every week or what ever. I had to go automated.
So I got the sprinkler timer like you said, and found the fittings to reduce it to 1/4"
I have it set to come on every 2 hours for 10 minutes. When I get home from work I can adjust the duration or intervals as required.
This whole thing has gotten completely rediculous. My friend has the identicle RO setup but with the tank, and his came from Aquasafe already set up to shut off when the tank was full. I should have gone that route 2 years ago.