RW09903 December 16, 2013 Share December 16, 2013 Is water filtered at 3.0-5.0 mega ohms/cm still safe for reef aquariums? The stuff I usually get is filtered between 15-18 mega ohms/cm. Link to comment Share on other sites More sharing options...
Origami December 17, 2013 Share December 17, 2013 Using this calculator, 5 megaohms/cm = 0.2e-6 mho cm which the calculator reports is 0.128 ppm, so it would seem that it's equal to RO/DI water. Link to comment Share on other sites More sharing options...
RW09903 December 17, 2013 Author Share December 17, 2013 That is an awesome conversion calculator. You would like a ppm below 5 to be considered DI, correct? I also found this chart. Link to comment Share on other sites More sharing options...
Origami December 17, 2013 Share December 17, 2013 Really, I want DI to be below 1 ppm. Link to comment Share on other sites More sharing options...
RW09903 December 17, 2013 Author Share December 17, 2013 Thanks for the advice, as I am trying to to provide the best environment for my fish and coral too. I am used to seeing 13-15 megaohms/cm, not 2.9-5.1 which the unit is reading currently. It might be time for servicing still. Link to comment Share on other sites More sharing options...
Origami December 17, 2013 Share December 17, 2013 13-15 megaohms is three times BETTER, not worse. Closer to 0.04 ppm. It's an inverse relationship between megaohms / cm and micromhos-cm. Thus, the higher the megaohms, the lower the micromhos. 1 divided by 1 ohm equals 1 mho. Thus, 1 million ohms (a megaohm) = .000001 mhos. Link to comment Share on other sites More sharing options...
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