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Old 03-26-2008, 01:48 PM   #1
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Pure Water

Ok, so I am trying to learn all I can on SW tanks before I take the plunge. I have lived right next to the Florida Keys my whole life, and have always loved the reefs.

Anyway, this question concerns water for the tank. I see that pretty much everyone uses a RO/DI unit to filter out there tap water. But I cannot find to much info on what needs to be done to maintain a RO/DI unit - is there parts that need replacing? filters to change? and how often?

ALSO, using something like a Pure water filter on the faucet will not be good enough? like some you see advertised for home drinking water.
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Old 03-26-2008, 02:56 PM   #2
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I assume that the cost per volumn of those pure faucets would be quite high compared to a RO unit.
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Old 03-26-2008, 03:19 PM   #3
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Replacement of filters, DI cartridge and RO membrane all depend on use. I only have a 35 gallon per day RO/DI unit and I change my filters every 6 months and my DI resin every yr and RO membrane every 2-3 yrs. A TDS meter will help determine how often a RO membrane needs to be changed.
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Old 03-26-2008, 04:23 PM   #4
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The "water filters" or PUR filters on the faucets do a decent job for drinking, but it doesn't produce "pure" water. My tap water runs about 88 ppm TDS. (TDS is "total dissolved solids" and is a measure of purity. Pure water will measure 0 ppm.) After I run my tap water through a Brita water filter, the TDS is around 40 ppm. Not even close to pure.
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Old 03-26-2008, 04:49 PM   #5
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Ok, that is not bad at all, I was really worried I was going to be running out every few weeks to replace everything. But if your getting at least 6 months out of it, then that is not bad at all.

OH! also, did you bother buying the pump attachment? or do you think regular pressure is enough?
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Old 03-26-2008, 04:54 PM   #6
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For me regular pressure was enough
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Old 03-26-2008, 05:23 PM   #7
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You need at least 45+ psi to make the RO/DI unit work properly. Unless you are on a well you will probably have that much or more in water pressure. Also checking the TDS of your water right out of the tap is a good measure of what kind of life you will get out of your filters. I have a 100gpd unit and I change my filters once a year. I have very good water where I am so that extends the life of my filters. I haven't changed the RO membrane as yet and I have had the unit 2.5 years. I still get a 0TDS coming out of my unit.

As a side note getting an RO/DI unit to start out with will save you a lot of headache down the road. The water you start with is the foundation that your tank will be built on so you want to start out with the best possible water.
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Old 03-26-2008, 07:28 PM   #8
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Is there a reason that simple bottled water can't work in a tank?
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Old 03-26-2008, 08:21 PM   #9
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Most of the time bottled water came right out of a tap somewhere and is not pure water.

Look here is the deal. If you are going to invest $1000s in an aquarium with delicate corals and fish why in the world would you negelect the biggest part of the whole system? Less then $150 for the most part will ensure that you have perfect water to start out with. To me it is a no-brainer. Check on ebay they sell for a lot less then that too. I got mine for $69.99 and $30 shipping online. By the time you spend the money buying water you could have picked up several RO/DI units and started your own water purification plant.
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Old 03-26-2008, 09:43 PM   #10
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I have to agree with Ziggy here. I have a 100 gpd unit. My tap water tests at 185 -215 ppm. I have clear cartridge housings on mine so I can see when the sediment filter gets dirty. I replace the sediment filter (10 micron) about 4 times a year. The two charcoal filters (5 and 1 micron) once year and DI when needed. Although my DI resin is color changing I don't replace it till the tds meter starts showing some tds after the unit.
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