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  #21  
Old 11-18-2005, 01:05 AM
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Quote:
Originally Posted by rickjames
If you mix IO with RO/DI water you end up with about 330 ppm calcium, depending on the specific gravity of the water, and a lower alkalinity.
I've found that too -- I'm not getting a good reading with IO and ro/di..very low in Ca and Alk.
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  #22  
Old 11-18-2005, 08:12 AM
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Originally Posted by Bob I
Red Sea because the price was right. When that is gone I will use Kent because I have a pail of it.
I use Red Sea as well. Price was great on boxing day
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  #23  
Old 11-18-2005, 10:56 AM
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Quote:
Originally Posted by Invigor
Quote:
Originally Posted by rickjames
If you mix IO with RO/DI water you end up with about 330 ppm calcium, depending on the specific gravity of the water, and a lower alkalinity.
I've found that too -- I'm not getting a good reading with IO and ro/di..very low in Ca and Alk.
Ditto! - Now I mix my RO/DI with Kent Osmoprep then with Kent Salt and I get 420 ppm Ca+ and 11 dKH... IO was 360 and 7 ... and 330 and about 5 with straight RO/DI...
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  #24  
Old 11-18-2005, 02:47 PM
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Why don't we get a few more comparisons, I'm finding this interesting. I'm going to do a water change this weekend with reef crystal in RODI water. I'll measure and report my CA and ALK readings as well.
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  #25  
Old 11-18-2005, 02:51 PM
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Quote:
Originally Posted by Matt
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Originally Posted by rickjames
Not entirely true. IO is formulated to mix with an "average" amount of minerals in water (i.e. tap water). Kent and others are formulated to mix with RO/DI water.

If you mix IO with RO/DI water you end up with about 330 ppm calcium, depending on the specific gravity of the water, and a lower alkalinity.
Sources? The Aquarium Systems website suggests that it is Reef Crystals that is formulated for tapwater use. The infamous S-15 Report (which uses apparently valid analysis for the mixes, although the scoring system that the sponsor uses to determine what's "best" is completely subjective and self-serving), shows that IO, Kent and RC are all substantially similar, nothwithstanding the marketing data.
My sources are personal experience using salifert test kits. Anthony Calfo also mentioned it in a water change thread on reef central a while. As well it appears that others on the board have noticed this.
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  #26  
Old 11-18-2005, 02:53 PM
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Quote:
Originally Posted by reeferaddict
Quote:
Originally Posted by Invigor
Quote:
Originally Posted by rickjames
If you mix IO with RO/DI water you end up with about 330 ppm calcium, depending on the specific gravity of the water, and a lower alkalinity.
I've found that too -- I'm not getting a good reading with IO and ro/di..very low in Ca and Alk.
Ditto! - Now I mix my RO/DI with Kent Osmoprep then with Kent Salt and I get 420 ppm Ca+ and 11 dKH... IO was 360 and 7 ... and 330 and about 5 with straight RO/DI...
Hey how much osmoprep do you use with the kent mix? I have a container of the stuff sitting around, maybe I should use it up.
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  #27  
Old 11-18-2005, 04:02 PM
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I used to use IO as well and switched to Kent for the same reasons (ca and alk were low) better now with Kent.
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  #28  
Old 11-25-2005, 03:36 PM
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I am using IO and I am switching to Kent today (well picking up a pail)

Jim
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  #29  
Old 11-25-2005, 08:42 PM
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Originally Posted by Abbyreefer
I used to use IO as well and switched to Kent for the same reasons (ca and alk were low) better now with Kent.
Same here
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  #30  
Old 11-25-2005, 10:47 PM
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Quote:
Originally Posted by Abbyreefer
I used to use IO as well and switched to Kent for the same reasons (ca and alk were low) better now with Kent.
I haven't found IO so low the levels can't be easily raised with additives, I don't like keeping my ca and alk too high because of mineral build up in powerheads. I keep my calcium around 380 and my alk at 9 dkh and the corals don't seem to suffer
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