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Old 04-08-2007, 06:41 PM   #1
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Ro-Di filter, are they all the same?

Hey, im looking to buy this Ro Di filter http://orangecounty.craigslist.org/hsh/305251626.html
Its not kent or any other popular brand im sure but will it do the same job as the ones that are advertised on aquarium websites and such?

thanks
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Old 04-09-2007, 09:43 AM   #2
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I don't know anyhting about the unit you linked to, but I cna say that not all RO units are alike. There is a world of difference in the quality of the components used.
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Old 04-09-2007, 11:32 AM   #3
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It's impossible to see the brand name on that filter. It looks like it's in good shape though, and also has a DI resin which is nice.

Steven is right, there IS a difference depending on which one you order.
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Old 04-09-2007, 04:57 PM   #4
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Quote:
Originally Posted by Steven Pro
I don't know anyhting about the unit you linked to, but I cna say that not all RO units are alike. There is a world of difference in the quality of the components used.
I totally agree.
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Old 04-09-2007, 08:09 PM   #5
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The price is good, however, you could very well end up spending more then that on new media and filter inserts for it. I would suggest replacing them all as you o not know the lenght of service or quality of source water it has filtered. While I think an RO/DI is one of the best investments you can get for your tank, make sure you get a decent quality one. Persoanlly, I like www.thefilterguys.biz
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Old 04-09-2007, 10:29 PM   #6
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Excellent points..I would also suggest checking on Ebay!
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Old 04-11-2007, 09:51 AM   #7
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I have been using a Aquasafe unit that I bought on Ebay a few years ago. To me, the unit appears to have done great and was a great price.

Lately I read threads on other boards where these Ebay units are dissed on. My argument here is as long as the TDS readings are 0-1 when it runs through the unit, are we not doing everything that can be done? I know the internals might be cheaper in some units but I don't really know the brand on my membrane or carbon filters. It seems to doing working though.

From what I have gathered, if your TDS of your tap water is low to begin with, you might be OK with a cheaper unit to some extent. With the cheaper internals, you might be making the DI chamber work harder and cause it to be depleted quicker. SOme of the Ebay units are being called cheap for there canisters and the fact that they have horizontal DI chambers. I can see the benefit of clear canisters and a vertical DI chamber but as long as the TDS is good at the end is something not being filtered?

Am I wrong in saying the above?
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Old 04-11-2007, 11:02 AM   #8
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I use the RO/DI unit off ebay and don't have an problems with it. I think it's a great unit for the price. But, a more expensive unit might "perform" better (ie: quicker, perhaps less TDS overall, more efficient in waste water output, etc) I dunno.

However, I've seen small units for sale that are priced extrememly low, that I just wouldn't buy for my tank. I think any 5 stage RO/DI unit or similar would be great for our tanks.
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Old 04-11-2007, 03:51 PM   #9
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Any RO/DI unit can produce water that has a 0 reading for TDS. The difference is how much the cheaper units are going to cost you in the long run in replacement DI cartridges.
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Old 04-11-2007, 05:36 PM   #10
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Any RO/DI unit can produce water that has a 0 reading for TDS. The difference is how much the cheaper units are going to cost you in the long run in replacement DI cartridges.
That is what I figured. Its just that some people really bad mouth these Ebay units. I have replaced my DI unit 3 times in about 2.5 yrs. Sometimes just because it seemed like it had been awhile. My TDS readings were still below 5.

I am going to add a add on DI chamber with re-fillable media after my current one is exhausted but I have been extremely happy with mine. There have been a few fights on RC on this issue though ...
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