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RO System Sizing for B2B Setup

 
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mjo2125



Joined: 27 Feb 2017
Posts: 215
Location: Dayton, OH

Drinking: FuP Helles Bock

Working on: TBD


PostLink    Posted: Wed Jul 24, 2019 7:44 pm    Post subject: RO System Sizing for B2B Setup Reply with quote


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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, Iíll 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
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Joined: 12 Dec 2010
Posts: 10200
Location: Ottawa, Canada

Drinking: German Lager, Electric Hop Candy Jr, Scottish 70/-, Cali Common, Maibock, Helles, Russian Imperial Stout, Black Butte Porter

Working on: Weizen


PostLink    Posted: Wed Jul 24, 2019 8:17 pm    Post subject: Reply with quote

As compared to buying RO water yourself I assume?

Pros:

- You don't have to buy RO water. Water is there, ready to use.

Cons:

- Up front cost, though should save you money over the long run (?).
- RO filters need to be replaced from time to time.
- Need a TDS meter to know when to replace filters.
- Very wasteful (you waste a lot of water making RO water).

Links with more info:

RO filtration system: https://shop.theelectricbrewery.com/pages/reverse-osmosis-filtration-system
RO water: https://shop.theelectricbrewery.com/pages/distilled-or-reverse-osmosis-ro-water
TDS meter: https://shop.theelectricbrewery.com/pages/tds-meter

(Note: These are work in progress pages as I completely rewrite/revamp the site!)

Kal

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Last edited by kal on Thu Jul 25, 2019 1:03 pm; edited 2 times in total
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Master



Joined: 30 Jan 2016
Posts: 166
Location: Virginia Beach, VA

Drinking: Liquid Schwartz Schwarzbier, Stinky Porter, Spiced Apple Cider

Working on: AbbyNormal Glutton Free Framboise Lambic, Ich Bin Ein Berliner Weisse, Pineapple Cider


PostLink    Posted: Wed Jul 24, 2019 8:35 pm    Post subject: Reply with quote

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: 658
Location: Midwest

Drinking: Black Sheep NEIPA, Rye Not Today, Kick of the Irish

Working on: RIS Barrel Aged


PostLink    Posted: Thu Jul 25, 2019 12:53 pm    Post subject: Reply with quote

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: 215
Location: Dayton, OH

Drinking: FuP Helles Bock

Working on: TBD


PostLink    Posted: Thu Jul 25, 2019 11:11 pm    Post subject: Reply with quote

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: 215
Location: Dayton, OH

Drinking: FuP Helles Bock

Working on: TBD


PostLink    Posted: Sat Aug 03, 2019 11:17 pm    Post subject: Reply with quote

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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