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Old 01-14-2013, 10:21 PM   #1
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Can You Recommend a Good RO/DI Unit?

I didn't know whether to post this in saltwater or freshwater... My tanks are freshwater, but it's my understanding that RO water is the same no matter which. I figured more salt guys use RO machines, so this forum will do.

I'm looking to buy a RO/DI water unit for my house. Here's what I'm looking for the unit to do:

- I don't want to permanently plumb it in my laundry room or under my sink. I would like to keep the unit free-standing and just hook it up to the sink faucet or outside where the garden hose hooks up when I need it.

- I have a 36 gallon and a 10 gallon that I do 30-40% water changes on weekly. Since I want to hook the machine up whenever I want to use it, I want a unit that can make the amount of water I need each week in no more than 4 hours.

- Something with inexpensive filter replacements.

I'm not looking for anything special... Just something that I can use once a week to produce RO water for my aquariums. I'm looking to spend around $100 and I don't want to spend any more than $130, but the cheaper, the better.

Once again, I want a unit that I can use when I want to! Not something that is permanently attached to my plumbing. I want to be able to wake up on Sunday (when I do water changes), take the RO unit outside, unhook the garden hose, attach the RO unit, and start making water.
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Old 01-14-2013, 10:49 PM   #2
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I have yet to get my unit but if you are looking fot something to produce RO in 4 hrs you will probably be looking at $175.00 depending on how many gallons you are wanting to produce in that time frame.
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Old 01-14-2013, 11:00 PM   #3
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I've actually been doing some research... Scratch the 4 hours thing. I think that I can easily set up my unit in my garage or laundry room to be a permanent thing. After watching some YouTube videos, it looks like everyone is getting the one from Bulk Reef Supply... It says specially made for reef tanks. Is that a marketing gimmick to get salt people to buy it or will it work okay with my freshwater too?
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Old 01-14-2013, 11:05 PM   #4
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It'll work for fresh as well. Rodi is rodi regardless of its application. I'd suggest the 5 stage plus model from BRS. Gl!
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Old 01-14-2013, 11:12 PM   #5
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The main thing I'm concerned about is hooking it up in my garage or laundry room incorrectly, then coming home one day to find that I destroyed my hot water heater or something... I've been watching some YouTube videos and it looks like it's fairly popular to put it in the laundry room with a Y splitter. However, it would be more convenient to put it in my garage because a storage container in the laundry room would make it cramped (it's a small room).

Do most of these filters come with detailed instructions on how to set them up?

The most I am willing to spend is $120, so will this one work okay? BRS 4 Stage Value RO/DI System - 75GPD - Bulk Reef Supply

Also, I'm probably going to get a 30 gallon container to store excess water in. Where would be the best place to buy something like that? If I get some standard container from Lowes, do I risk any contaminants from the plastic getting into the water?

If I get a container and have the unit running 24/7, I'll probably get this too. Will it work with the unit linked above?
Reverse Osmosis Float Valve - Bulk Reef Supply
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Old 01-14-2013, 11:30 PM   #6
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Filter Direct Online Store (C)

I have this exact system, except mine was an RD-106 (With out the booster pump), I added a booster pump years later, best thing I ever did for my RO system.

The RD-106 provides you with an ouput that is RO+DI for aquarium water, and an output for drinking water (Sink Faucet/Ice Maker).

If you don't want a drinking water system and only plan to use it for Aquarium use only, then i suggest this system:

Filter Direct Online Store (C) (100 GPD)
Filter Direct Online Store (C) (150GPD)

The BRS isn't a bad deal, comes with a built in TDS meter, many people say the 75GPD membrane actually creates more pure water than a 100GPD membrane.

At the end of the day remember that most of these systems all use the same components, its just how they package them and market them. So find the best bang for the buck. Just make sure it uses STANDARD filters & membrane, you will always be able to find filters/parts for them.

What ever you do I would not even think about an RO system with out a booster pump (Unless your house pressure is 75-80PSI), the booster pump makes a night and day difference boosting your house pressure to 80PSI making your RO system run at 100% capacity and waste less water.

My 75GPD membrane (Use to be 100GPD, but changed to 75GPD), probably made MAYBE 20-30GPD before the booster pump @ 54PSI house water pressure. Now with the booster pump running I get 78GPD production out of my 75GPD membrane @ 80PSI input pressure.

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Old 01-14-2013, 11:37 PM   #7
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i just bought a ro/di unit for my 20 long and my friend who has a 20 as well. I bought the 75 gpd 4 stage plus from bulkreefsupply and i love it! the built in tds meter and pressure gauge is perfect, sturdy product but i dont know anything about the set up so if it were to mess up I would be screwed. Every 2 weeks or so ill hook it up to my backyard garden hose and fill up 10 gallons, takes all morning. It cost 180 but was worth it, if you buy your own tds meter it will be confusing to install if you dont know anything about ro units like me.
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Old 01-14-2013, 11:41 PM   #8
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Here's a question for you... The reason I need RODI water is because I spent $100 on some orange eye blue tiger shrimp with the sole intent on breeding them and selling the offspring to fellow hobbyists. They produce about 20 offspring a month and each shrimp is worth about $7. This could easily pay for all of my aquarium expenses without me having to break the bank buying fish, supplies, etc.

My shrimp aren't breeding, though. Pretty much everyone tells me I need RODI water which is perfect. The shrimp tank is only 10 gallons and I change about 3 gallons every week. I COULD use RODI water in my 36 gallon, but all my fish in there do fine with regular tap. So I only NEED the water in my 10 gallon which results in only 3 gallons a week.

Would it just save me the headache and the expense of my own RODI unit if I just went to the grocery store and paid the $0.30 a gallon to fill up jugs there? My LFS also sells water, but it's 30 minutes away and the grocery store is only like 5 minutes away. Plus the LFS sells it for $0.70 which is more than twice as much.

Since I only need 3 gallons a week, would I just be smart to get the water from the grocery store?
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Old 01-14-2013, 11:43 PM   #9
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youll have to buy a tds meter and somehow test their water because there is no knowing how often they change their filters, you can try asking them
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Old 01-14-2013, 11:47 PM   #10
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I already have a TDS meter. My tap water is 120 ppm, so anything would be better than that.

I mainly need the RODI water for the low pH qualities and the pureness of it. So even if its like 10 ppm at the grocery store, it would probably do.
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