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Old 04-07-2019, 11:50 AM   #1
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Added RO water system

Got tired of always running out of drinking water in the most inopportune times.
Now even the ice maker gets clean filtered water.



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Water bay, right side.

7 stage RO system with UV light.
with small storage tank.


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Drinking water at the sink.


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Under the sink:

1- 1/4inch tube to the RO
2- Clean water from filter
3- to the ice maker (original feed from #1)
4- To the sink water spicket.
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Old 04-07-2019, 12:16 PM   #2
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Just make sure you keep your gray water dump valve open all of the time.

Bruce
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Old 04-07-2019, 01:03 PM   #3
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Just make sure you keep your gray water dump valve open all of the time.

Bruce
Not sure I understand that.

I see no reason the gray tank valve open or close has anything to do with the water filter. The RO system is a closed system, even the back flush goes back to the fresh water tank via the overflow pipe, the amount or impurity in the backwash water going back is negligible as it is assumed the fresh water to already be clean enough.
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Old 04-07-2019, 01:27 PM   #4
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Not sure I understand that.

I see no reason the gray tank valve open or close has anything to do with the water filter. The RO system is a closed system, even the back flush goes back to the fresh water tank via the overflow pipe, the amount or impurity in the backwash water going back is negligible as it is assumed the fresh water to already be clean enough.
This system doesn’t dump its waste water into the drain? That’s great if the waste water is routed to the fresh water tank — that would make for a RO system with zero waste.

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Old 04-07-2019, 02:11 PM   #5
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This system doesn’t dump its waste water into the drain? That’s great if the waste water is routed to the fresh water tank — that would make for a RO system with zero waste.

Bruce

Bruce,
That is exactly what I did.
I connected the "waste" line back into the fresh water tank.

On the first picture, note the black 1/4 inch tubing going from the RO system into the valve on the fresh water tank overflow line to the right side of the picture.


The first time I ran it, I noticed that the pump ran a lot, come to find out that the new systems have some automatic valve for the backwash that is based o pressure, the pump pressure is not enough to trigger the automatic shutoff of the backwash valve.
The fix was to put a manual shutoff valve in the backwash line going back to the fresh water tank, and every time I am connected to shore water at 50+ pressure, I open the valve and let the backwash do its thing for a while, when it is done or I disconnect from shore water, I close the valve, just like the old manual system.

Usually a 10 to 15 minutes backwash is enough to clean the RO filter.
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Old 04-07-2019, 05:16 PM   #6
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How are you getting it to produce filtered water without constant pressure to force the water through the RO membrane? I would think you should need a secondary booster pump to draw water from your water tank if you arenít using your standard pump or you arenít on ďcityĒ water.

How are you achieving this?

Bruce
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Old 04-07-2019, 05:33 PM   #7
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How are you getting it to produce filtered water without constant pressure to force the water through the RO membrane? I would think you should need a secondary booster pump to draw water from your water tank if you arenít using your standard pump or you arenít on ďcityĒ water.

How are you achieving this?

Bruce
Feeding the system from the pump in the coach. 40# is enough to go thru and to keep the small holding tank full. I dont expect lots of water but enough to drink, cook, coffee etc..

Pict 3 under sink, the source (1) is the 1/4 in tube that was going to the icemaker into the RO system.
Works great.
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Old 04-07-2019, 07:02 PM   #8
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Feeding the system from the pump in the coach. 40# is enough to go thru and to keep the small holding tank full. I dont expect lots of water but enough to drink, cook, coffee etc..

Pict 3 under sink, the source (1) is the 1/4 in tube that was going to the icemaker into the RO system.
Works great.
Got it!

Now I understand what you were saying/describing about the manual valve.

Bruce
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Old 04-07-2019, 07:09 PM   #9
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Even with "clean water" in the FW tank, you will eventually build up to minerals in the FW tank making the RO element work harder..
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Old 04-07-2019, 07:49 PM   #10
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Even with "clean water" in the FW tank, you will eventually build up to minerals in the FW tank making the RO element work harder..

Perhaps, I figure that even with a small amount of unfiltered FW usage for amount of minerals back into the tank it will end up diluted every time you refill the tank, the worst is to have to replace the RO filter after a few years.
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