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Old 01-17-2011, 03:55 PM   #11
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Ok Cmor I have a huge question. Aquarists aren't supposed to use distilled water because it is tooooo pure. Now, everyone at AA champions RO water. Isn't it the same thing Pure is Pure.
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Old 01-17-2011, 04:51 PM   #12
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... Aquarists aren't supposed to use distilled water because it is tooooo pure....
You might be confusing freshwater with saltwater. I've never kept freshwater, but I think "pure" water for them is not a good thing. They need the stuff in the water to make it hard, the right pH, etc. With a saltwater tank, you're adding a salt mix and getting all that stuff back anyway. So to start with pure water, you insuring that your water will be the same everytime and you're not introducing excessive nutrients from your tap.
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Old 01-17-2011, 05:07 PM   #13
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You might be confusing freshwater with saltwater. I've never kept freshwater, but I think "pure" water for them is not a good thing. They need the stuff in the water to make it hard, the right pH, etc. With a saltwater tank, you're adding a salt mix and getting all that stuff back anyway. So to start with pure water, you insuring that your water will be the same everytime and you're not introducing excessive nutrients from your tap.
so does RO/DI lower the PH to neutral and the hardness to Neutral?
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Old 01-17-2011, 05:35 PM   #14
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RO/DI leaves you with nothing but H2O, so you will really not be able to measure the pH very well (since pH is a measurement of the H+ ions, and the water is de-ionized) and there is essentially no buffer at all (KH=0). It is a "clean slate" to which you add the salt mix, which provides everything that needs to be there.
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Old 01-17-2011, 06:53 PM   #15
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oh ok thanks for the info

my tapwater right now comes out at PH 8 and KH 180
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Old 01-17-2011, 08:07 PM   #16
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RO/DI leaves you with nothing but H2O, so you will really not be able to measure the pH very well (since pH is a measurement of the H+ ions, and the water is de-ionized) and there is essentially no buffer at all (KH=0). It is a "clean slate" to which you add the salt mix, which provides everything that needs to be there.
Yup yup. Even though you *can* measure the pH of pure water, and you'll get a number, it's useless to do so. Since there is so little of what you're measuring to arrive at a pH value, any little mistake in the testing or any contaminant that might be left in the vial from a previous test is going to skew the results more than they normally would.
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Old 01-17-2011, 08:52 PM   #17
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so what type of RO/DI unit do you guys recommend?

are the ones off ebay any good?

AQUA REEF RO DI REVERSE OSMOSIS PUR WATER FILTER SYSTEM on eBay.ca (item 380306867611 end time 17-Jan-11 22:07:50 EST)
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Old 01-17-2011, 09:08 PM   #18
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they are basically a bunch of plastic cases that hold filters. it's the extras that set them apart. like pressure gauges, built in T.D.S. meters..etc.
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