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mjo2125
Joined: 27 Feb 2017 Posts: 248 Location: Dayton, OH
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Link Posted: Wed Jul 24, 2019 7:44 pm Post subject: RO System Sizing for B2B Setup |
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I have a 15 gallon 50amp B2B setup and looking at an RO system with a 14 gallon tank. The RO system recovery time is about 20 minutes per gallon. Most of the time, I’ll brew 5 gallon batches or an occasional 10 gallon batch. I may do B2B 5 gallon batches. Any thoughts on the pros and cons of a 14 gallon RO for this setup?
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kal Forum Administrator
Joined: 12 Dec 2010 Posts: 11116 Location: Ottawa, Canada
Drinking: Pub Ale, Electric Creamsicle, Mild, Pliny the Younger, Belgian Dark Strong, Weizen, Russian Imperial Stout, Black Butte Porter
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Master
Joined: 30 Jan 2016 Posts: 171 Location: Virginia Beach, VA
Drinking: Naked Singularity Stout, Hurricane Bohemian Pilsner, Pineapple Cider, Ich bin ein Berlinerweiss, AbbyNormal Glutton Free Lambic
Working on: Vienna Lager. Witty name to follow.
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Link Posted: Wed Jul 24, 2019 8:35 pm Post subject: |
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When I do larger or B2B batches, I fill my 5g glass carboy and seal it the night before, that plus the 9 gallons I get out of the tank is normally enough to brew with.
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dp Brewing Company
Joined: 08 Jul 2013 Posts: 664 Location: Midwest
Drinking: Chocolate Taco, Raspberry Mango Cider, American X, Sandy Dunes
Working on: Nothing
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Link Posted: Thu Jul 25, 2019 12:53 pm Post subject: |
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I just get my mind past the waste water to finished RO water you get ration. It goes against how I live in most cases. If I could find a good use for the waste water I'd be all in.
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mjo2125
Joined: 27 Feb 2017 Posts: 248 Location: Dayton, OH
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Link Posted: Thu Jul 25, 2019 11:11 pm Post subject: |
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The concern over waste water is valid. Residential RO equipment typically takes 3 gallons of raw water to make 1 gallon of treated water. The vendor website says many RO owners re-use waste water in gardens, swimming pools, aquariums, etc. For a small household, the waste water is equivalent to an extra 2 to 4 toilet flushes a day of used water. I'll consider if there is anything I can do to re-use the waste water.
I have an client that has an industrial RO system (large tanks, pumps, etc). The recovery rate is 98% with 2% reject water being injected into deep wells to be filtered in the earth (and monitored by the EPA). It would be great if residential systems were that efficient.
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mjo2125
Joined: 27 Feb 2017 Posts: 248 Location: Dayton, OH
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Link Posted: Sat Aug 03, 2019 11:17 pm Post subject: |
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Found out the old RO system in the basement has a permeate pump (black box in the picture). The Permeate Pump is a non-electric pump which uses hydraulic movement of the reject water to pull additional purified ("permeate") water into the storage tank thus reducing waste water and increasing efficiency. I tied my new system into old. The old system will be a back up if I need more capacity. The pump should increase the efficiency of the system to 80%.
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