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Old 07-15-2010, 09:44 PM   #1
Mylo
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Default RO Water Storage

Does anybody know of any practical purpose of the specialized RO reservoirs that come with the "under the cabinet" systems (2 gallon?). I know then have a pressurized bladder in them - is that just to push the water back up and out the faucet? The large ones are expen$ive!

Long story short... I'm getting tired of only collecting 2 gallons at a time. I have to plan well ahead for my brewday. I want to build a collection tank with a float switch on it that will fill a larger holding tank. If I have to, I'll put it up on the wall above my HLT with a nice, large spigot on it.

I don't think I need anything bigger than 10 gallons. Anybody have any links to food grade plastic tanks that I can use about this size? Anybody see any issues with this?

Thanks.


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Old 07-15-2010, 09:51 PM   #2
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the air bladder tank lets you store the water under pressure so the pump don't burn out and that water comes out when you pull on the faucet. (wow i am quite articulate today)

if you are fine with gravity feed into your hlt you should have no problem taking a tap of the bladder tank with a solenoid and feed a tube/pipe to the storage tank.

I would put the solenoid valve closest to your ro system. you could also use a ball valve if you have an over flow on you tank. (now thinking about it an over flow is not a bad idea ether way)

i was thinking about doing something similar for my brew hut.
try us plastics for a tank

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Old 07-15-2010, 10:50 PM   #3
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A buddy of mine just brought up a good point... Storing all that water could get funky with algae, etc... Now that I think about it - that's probably the other reason for the bladder - no air ever goes into the tank. Maybe I could use one of those sterile filters that B3 sells to filter the air that goes in, to prevent mold and algae spores from getting in there. It's all pre-boil - so I guess I'm not that concerned with anything else - especially if it doesn't affect the water's flavor.

Probably best practice for a "homegrown" storage system like this is to leave it dry... I wouldn't mind flipping it on a few days ahead of time - as long as it shuts off automatically when it gets to 20Gs.

What do you all think?


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Old 07-15-2010, 10:56 PM   #4
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Use a black tank, algae needs light.

edit:
sorry phone started to ring; anyway

leaving it dry is fine, i like the idea of having a valve shut off after 20g. I would make all the connections tubing so that you can flip it up side down because you will never be able to drain the last bit out. (unless you use a cone of course)

probably do something like this (could be simplifyed now that i look at it) :

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Old 07-16-2010, 01:28 AM   #5
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Another option rather than RO water storage would be to put another RO membrane in parallel with your existing membrane. This would double your RO output and cut your filling time in half. You could put quite a few membranes in parallel. This could get pricey initially, but would extend the life of each one since they would be only filtering a fraction of the water coming through.

If you want to go the storage tank route; one idea would be to use a keg. They're readily available and somewhat inexpensive. You could mount your float valve/switch in it to control your water level. You could also hook up a CO2 tank to purge the air and keep it under a very low pressure to keep O2 out, just like a kegerator. Might even be able to use the CO2 to push the water to your tun. I might be over-thinking this a bit.

BTW, is this your setup? I have it saved in my bookmarks to steal ideas from later.

EDIT: Here's an example of a second membrane upgrade.
http://www.bulkreefsupply.com/store/...rade-kit.html#

EDIT EDIT: You'd want to bypass your undersink storage tank to do this too.

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Old 07-16-2010, 02:12 AM   #6
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I'd install a kent float valve into the top of the sidewall of a 15 gallon open head barrel. Put a manual ball valve on before that so you can only open it the day before you want to brew. That way the water only sits around for a day.

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Old 07-16-2010, 03:33 AM   #7
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Quote:
Originally Posted by Mylo View Post
Does anybody know of any practical purpose of the specialized RO reservoirs that come with the "under the cabinet" systems (2 gallon?). I know then have a pressurized bladder in them - is that just to push the water back up and out the faucet? The large ones are expen$ive!

Long story short... I'm getting tired of only collecting 2 gallons at a time. I have to plan well ahead for my brewday. I want to build a collection tank with a float switch on it that will fill a larger holding tank. If I have to, I'll put it up on the wall above my HLT with a nice, large spigot on it.

I don't think I need anything bigger than 10 gallons. Anybody have any links to food grade plastic tanks that I can use about this size? Anybody see any issues with this?

Thanks.


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Old 07-16-2010, 11:53 AM   #8
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I just use empty culligan bottles.. apparently thats far too simpleton.

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Old 07-16-2010, 12:11 PM   #9
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Talk to your LHBS about getting one of their empty extract barrels. You could probably get one free.

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Old 07-16-2010, 12:21 PM   #10
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Get a gray Brute container from Lowes/HD and use that for a resevoir to fill the day before. Like Bobby said you can add a float valve to shutoff the flow and I'd pair that with an auto shutoff. The floats can still let water by if you have high enough incoming pressure, but the autoshutoff cuts your incoming water to the ro off when it senses backpressure being caused by the float.

Don't worry about algae/funk too much so long as you cover the vessel. RO is stripped of essentially everything and isn't too condusive to growth. My RO/DI and saltwater drums are always full in my basement and they might get cleaned once a year.




page 11 shows the setup installed.

http://www.spectrapure.com/manuals/P...K_SPFK_FLC.pdf

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