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Old 04-27-2006, 04:16 PM   #31
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Join Date: Apr 2006
Location: Florida
Posts: 23
On this unit the vlave should be closed to create backpressure. I have this same model. This is word for word from the Instruction Manual...

The dischacharge line has to have backpressure or the RO will not work. Most vendors choose the cheap way to create this backpressure by putting a little plastic insert into the discharge line. We have chosen to spend the extra money and buy and mount a manual flushing flow restrictor. The NORMAL POSITION for this switch is at a 90-degree angle to the line.

If your RO unit does not have this type of flow restrictor valve then I would say yes the waste line should be open but on this model with the flow restrictor valve it should be closed to cause backpressure and force the flow through the RO membrane. My tap water has TDS of around 300 in and I am now down to a reading of 9 out of my RO/DI unit with the valve in the closed position. I still have plenty of water coming from my waste line so it is not like closing the valve prevents the waste water from coming out...it still comes out.

Hope this helps....Mark

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Old 04-27-2006, 08:42 PM   #32
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Join Date: Jan 2006
Location: Wichita Falls, Texas
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Adding fuel to the fire. This appears to another ro/di unit very very similar to mine where the waste valve is "CLOSED" or at least parallel to the waste line. http://cgi.ebay.com/USA-110GPD-RO-DI...QQcmdZViewItem
Apparently the key to these systems is the auto shut-off valve. When the storage tank becomes fully pressurized the incoming water shuts off as well as the waste flow. When you open the faucet and reduce line pressure the waste valve flow restrictor opens and produces and drains the "bad" water. I'm now convinced my system is working properly. It just confused the hell out of me at first. Everybody says the waste valve HAS to be open, but no, not if if you have the patented flow restrictor valve.

BTW, TDS meter on order! 8)

7 month old 100 gallon. Hopefully on my way to a great reef tank. A few small fish and a few small soft corals. T5 HO Lights and ro/di unit.
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ro/di, unit

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