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Old 02-14-2012, 09:37 PM   #951
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You usually start with a RO/DI filter that is plumbed in to run all the time. Then a small storage tank can be added and the float can turn the water on and off. If you have an electronic float switch, that can be attached to a small pump that uses water from a storage container. Using a appropriately sized container will help prevent a tank wipeout from a runaway float.
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Old 02-14-2012, 09:40 PM   #952
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Well, okay, so I was picturing a t-connection under the sink or wherever, and they do you use an electronic ball valve or butterfly, hooked into the float switch, in the intake line to the RO unit.

I guess that's where I was confused.
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Old 02-14-2012, 09:41 PM   #953
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Mine works all on water pressure. You can put in electronic valves, but it s much easier to go the dosing pump way.
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Old 02-14-2012, 09:49 PM   #954
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Sorry Greg for my ignorance on this, maybe I'm just missing something obvious.

How are you stopping the RO/DI from running? If you have an RO hardlined into the water supply, wouldn't it constantly run because there is continuous water pressure?

How I make RO now is with a portable RO unit (same one several people have on here). I hook it to the faucett, run 30 gallons into a brute trash can for storage to make saltwater, and then I fill an additional 10 one-gallon jugs of clear RO for top-off manually.

I want to add another small storage container near my tank that would hold 5-10 gallons of fresh RO, and hook that to my ATO. Therefore I only need to fill about once per week instead of daily.
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Old 02-14-2012, 09:59 PM   #955
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I have my rodi on the washing machine cold line and then I run it straight to my top off water to a float valve not a float switch then I t it off to my premixed water where another float valve is so as water is used it is toped off automatic thus keeping every thing filled up and teady
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Old 02-14-2012, 10:04 PM   #956
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I drew u a pic

Attachment 76664

Sorry it's on a Mac tools packaging I am at work it's all I had
I hope this will help
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Old 02-14-2012, 10:11 PM   #957
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So the float valve actually stops the water from flowing through the fill line.

Thats where I was lost. I couldn't understand how the water would stop flowing.

Fantastic.

Edit* I love MAC by the way!
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Old 02-14-2012, 10:14 PM   #958
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If this is a pressure type float (no electrical connection) it is designed to work off a pressurized storage tank hooked to your filter. You don't have to use the tank, but it has the advantage of giving you a few gallons on demand whenever you need it, nice for rinsing things, making up solutions, etc. The RO/DI filter would remain on all the time. It shouldn't discard any waste water until it is used. This is how my system works, but you have to keep an eye on it.

If you use a open freshwater storage container, it can be above the sump and gravity feed to the pressure switch. If you use a controller and a electronic float switch, you use a small pump to move the freshwater.
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Old 02-14-2012, 10:15 PM   #959
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Yes it will stop the flop putting back pressure to the rodi unit shutting it off only if your unit has a shut off valve on it .....
It is a little box that will be on the top of your unit
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Old 02-14-2012, 10:24 PM   #960
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Got it guys, thanks for the patience. I think the reason that I was having so much trouble understanding is because I have the cheap ebay $65 unit with no frills. Its just a quick and dirty.

As soon as my filters go bad on this one, I'm going to upgrade to the nicer 4 or 5 stage from BRS.

In the meantime, I figured for now I would just use the small pump method.

At this point, its more about keeping salinity in check and the ease of a once a week fill, rather than a daily top-off.

I'm still in an apartment for the time being, so I am somewhat limited as to what I can do.
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