swweeeeet I'll be checking that out!
For those interested here is what you will need. This is to setup automatic RO water storage. I have plumbed together 2 160L Plastic barrels using bulkhead fittings. My garage where the RO unit will be installed is about 15M from my tank so I have also plumbed up a 3,000LPH Submersible pump in one of the barrels which is rigged up to a ball valve and quick fit hose connection.
From what I understand the best way to 100% shut off an RODI unit is by using a solenoid valve on the inlet line. This way you do not get
TDS creep.
I have put together a list of the components.
Solenoid Valve:
http://www.ebay.com.au/itm/290836300351?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
These solenoids are the bomb! Already comes with the plastic quick fit connections to hook up to your RODI unit! They are 24VAC Normally closed Continuous Duty. Coil Power is 6 - 6.5VA. So basically they are in the closed position unless they are provided with power.
Float Switches:
http://www.ebay.com.au/itm/300450253588?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
I got 2 of these. I decided to get these ones because they are a bit longer and water does not have to reach right to the top. I have installed one on the lid of each barrel as a fail safe so if either barrel fills with water, the circuit will break and shut the unit off.
Now you can power these solenoids using a Irrigation/reticulation controller. I'm lucky, I actually already have a Rainbird ESP Controller which controls my garden sprinklers. It also happens to be in the exact same spot as where I want to store my reservoir in my shed with the garden tap on the other side.
I have had to buy an additional module because I have no more spare stations for an extra solenoid as I already have 7. The RODI solenoid will be the 8th.
The sprinkler solenoids are all wired together on what is refereed to as a "common" wire which goes to "COM" (See Black wire).
The other wire on each of the solenoids then goes into their respective stations (See coloured wires 1-7).
The circuit is a very simple loo.
COMMON WIRE ------SOLENOID------FLOAT SWITCH 1------FLOAT SWITCH 2------STATION 8 on the Controller.
Controller can be scheduled to switch on at any time for any duration of time. I know this seems complicated but it's actually quite simple. You do not need an irrigation controller to make this work and you can get transformers to make it work but this is the easiest and you can get some very inexpensive ones.
I haven't finished putting my system all together but once I do, I will post the photos up and it should make sense.
Joey.