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Old 06-08-2010, 01:21 PM   #1
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RO DI Water System Question

I was looking into getting a RO DI System. Im looking into getting this one:
Reef Aquarium RO DI Reverse Osmosis Water Filter 75 gpd - eBay (item 270587407676 end time Jun-10-10 22:45:06 PDT)

It says its 75 gallons per day. Does that mean when I reach 75 gallons I have to change the membrane or something on it? I'm confused by that.
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Old 06-11-2010, 05:39 PM   #2
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No that just means if you let it run all day with the right water pressure (normally around 50psi) it will produce 75 gallons of water.
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Old 06-11-2010, 08:01 PM   #3
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Correct. It will make 75 gallons per day at water of 50 degrees or higher and water pressure of 65 - 70 psi.

I notice there is no pressure guage built into that unit. I consider that to be important, but it depends where you live. My tap is below 50psi and in the winter gets very cold. I added a booster pump and now get the rated 150gpd out of my membrane.
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Old 06-15-2010, 03:13 PM   #4
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it will also produce around 300 gallons of waste water, so plan accordingly.
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