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Old 07-16-2008, 12:35 PM   #1
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Reverse Osmosis (RO)

I am reading some literature on reef tanks and getting prepared. The information on Reverse Osmosis (RO) water purification system and weather I need to have one is all over the board. I also have used tap water for my tank. They say this is bad. I have had the tank established for 2 years with fish only and some live rock. How necessary are the RO's and do I have to drain my tank?

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Old 07-16-2008, 12:50 PM   #2
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RO/DI is the best thing for a tank. You can find themon ebay for around $100. Look into the 75GPD units.
Are you hving water issues?
I wouldn't drain my tank, just start using the RO/DI water when you pre mix your water.

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Old 07-16-2008, 01:08 PM   #3
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Read this. I have a good link at home on why you should not use tap. I`ll send post it tonite when I get home.

Proper Aquarium Water Quality: What is Reverse Osmosis Water? Basic FAQ's
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Old 07-16-2008, 08:16 PM   #4
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And there's no need to drain and refill. Just start using RODI water for top off and pwc's. It will help and will replace all the tap over time.
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Old 07-16-2008, 09:10 PM   #5
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Do a phosphate and ammonia test on your tap too.

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Old 07-16-2008, 10:39 PM   #6
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Chemistry and the Aquarium
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Old 07-16-2008, 11:51 PM   #7
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I started out my tank with filtered tap water that at least took out the heavy metals and chlorine... probably some ammonia too. I went that route for about 6 months with no ill effects - water tested "perfect" with all the test kits I had. And of course, after determining my water was "perfect", I stopped testing my source water.

Suddenly nitrates started showing up in my QT no matter how much water changing I did. (Main tank was bigger so it took much longer to show up there.) Long story short, my "perfect" water supply now had nitrates that were showing up more than before. Who knows what else was in there that I couldn't test for.

Point is... municipal water supplies are anything but constant. Their quality can change on a moments notice depending on many many things that are beyond anyone's control. The only way to control it is to take charge of our own purification.

There are plenty of folks that do just great with tap water, properly treated for heavy metals and chlorine/chloramine. It worked fine for me in the beginning, and would probably still be working fine if I was willing to put up with 5-10ppm nitrates in my tank. But they're always running the risk that something in their water system may break down and they won't find out before they've contaminated their tank. I know in Western WA there are normally "no drink/boil your water" notices that come out for various areas several times a year when something goes haywire at a treatment plant.

I now use filtered water run through DI resin to make sure my water is the same from batch to batch - no doubts in my mind.

Just my nickels worth.
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Old 07-17-2008, 01:33 AM   #8
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If/when you decide to buy one, a good place to buy RO/DI units and stuff is: http://www.buckeyefieldsupply.com
They are extremely helpful if you have questions, they sell quality stuff, and their prices are good especially for replacement filters.


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