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Old 10-03-2011, 07:38 PM   #1
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What RODI unit should I get?

I found RODI unit for 65$ and it says it starts puriying under 35 PSI and I dont know what my sinks are. Should I just get it?
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Old 10-03-2011, 07:42 PM   #2
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It also says i would have to replace the DI every 500-1000 gallons. Could I just wash it out or something? I HAVE NO IDEA HOW THESE WORK!!!!! HAHA
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Old 10-03-2011, 07:42 PM   #3
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Any RODI will make water at low psi, but with high waste. Are you US? A booster pump will save a lot of water if you have low pressure
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Old 10-03-2011, 08:05 PM   #4
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What do u mean with high waste? Wont it just be useless then? Yes im in the US. I think my sink is pretty normal.
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Old 10-03-2011, 08:25 PM   #5
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5 Stage 100 GPD REEF AQUARIUM REVERSE OSMOSIS WATER SYSTEM RO DI
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Old 10-03-2011, 08:47 PM   #6
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what is meant by high waste is that instead of having close to a 1:1 ratio you'll be at like 3-1 or possibly worse... also it runs fairly slowly. I have 20 lbs of pressure, it takes me about 30 hrs to fill my 18 gallon tank while the waste tank (also 18 gal) fills in about 8-10hrs.

a booster can be had for around 80 if you look around, i dont have the link currently for some reason. I will be getting one, but the filter works without it.
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Old 10-03-2011, 08:52 PM   #7
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this is the one i have, But i know with normal pressure the unit works well as many others on this site use it, Carey was the one who tested it first for us, and she's had great results with it i know.

http://www.purewaterclub.com/catalog...roducts_id=313
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Old 10-04-2011, 08:22 AM   #8
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For every one gallon of filtered water you get, 3 to 5 gallons of water will pass out of the filters waste tube. That water is filtered through the first few stages and then moves through the RO membrane. I use it for my FW tank, others fill their washing machines, or water the lawn with it. It is good water, but higher in TDS than your tap.

DI resin takes the water that is filtered through the RO membrane and brings the TDS to 0. Once it is depleted, it is cleaned out of the cannister and new resin is packed in.
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Old 10-04-2011, 09:31 AM   #9
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Having been in this business for going on 15 years, and because much of that time we have had a focus on RODI systems and supplies for the marine aquaculture trade, my advice to you is ...

Watch out!

Any system retailing for $65 is probably not worth having. I would look elsewhere, especially if you are unfamiliar with these systems and don't feel like you are making an educted purchase.

Could we make a $65 system? Sure. But I wouldn't be able to sleep at night if I sold it to someone.

Russ
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Old 10-04-2011, 09:32 AM   #10
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Here are some things to look for in a good system for this hobby:

No more than 4 stages (sediment, carbon, RO, DI) unless you have specific water quality issues you want to address
Standard-sized prefilters, membrane, and DI cartridge
Brand name, high-rejection membrane
Specifications provided for each stage
Pressure gauge after the prefilters and before the membrane
Thermometer
TDS meter (handheld or in-line)
DI bypass
Vertical DI stage
Refillable DI cartridge
Aluminum bracket
Quick connect fittings
No water from pressurized storage container delivered to DI
Flush valve
Clear housings
High-quality instructions written in clear English
Customer support before, during, and after your purchase
A vendor involved in your hobby

Russ
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