Clip on Float Valve for ATO

[g6gang]

I have a BRS RODI Unit that I have been manually using with a garden hose and timer, and I would like to do something more automated. BRS has a float valve: http://www.bulkreefsupply.com/reverse-osmosis-float-valve.html that will work by drilling into a container, but my resovior is an old tank that I do not want to drill. So I am looking for something I can clip on to the resovior.

Also, when the unit is not producing water but the water supply is still on, does it build up pressure where I need to be concerned about leaks? All of the components will be in the house. This is also why I have been hesitant to have it in full auto mode.

 

[g6gang]

Forgot to mention I also have a Reef Angel controller with two float switches. Any ideas on how and what you need for auto shut off to an ATO/Rodi system