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Old 08/08/2018, 10:40 PM   #1
Etoimos
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Compensate for the increase of salinity from dosing Magnesium?

I just started dosing Magnesium and it is raising my salinity. Should I be compensating for this increase in any way (removing saltwater and replacing with RODI?)?

Thanks,

Keith


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Old 08/09/2018, 07:30 AM   #2
Uncle99
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Yes, add RODI to keep salinity stable.
This increase is normal when adding larger amounts of MG, especially DIY powers, for some reason.
I assume your bringing MG up to around 1350 ish, then maintaining from there.
I have noticed no change in my salinity in my 70g. I use Seachem magnisum and it only takes 10ml per week to maintain 1350 ish...


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Old 08/09/2018, 01:15 PM   #3
bertoni
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I agree that some RO/DI will solve the problem. I'd do that gradually, though. How high is the SG currently?


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Old 08/09/2018, 03:09 PM   #4
Etoimos
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It's about 2ppt higher than what it normally is. Digging into it further, I don't think it is solely related to the dosing of Mag. It seems to have crept up slowly over a much longer time frame looking at the Apex logs.


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Old 08/09/2018, 03:19 PM   #5
Uncle99
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ATO will fix that and add great stability to this important parameter


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Old 08/09/2018, 06:46 PM   #6
outssider
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dosing cal/alk/mag will increase salinity over time


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Old 08/09/2018, 10:23 PM   #7
bertoni
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I agree that dosing a 2-part will increase alkalinity. 2 points up is a bit high, but I'd bring it down over a period of at least a few days, or maybe a week or so.


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Old 08/12/2018, 05:36 AM   #8
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I don't see how magnesium, calcium or alkalinity would raise "salinity". I can understand that it can raise "gravity" or "conductivity" (our affordable means of measurement), but not chloride and sodium? Going from this principle, since only gravity and conductivity is changing due to the addition of metal (mg) to the water, should you realy care about adjusting your salt level, or you are only risking changing actual "salinity" level by trying to adjust "gravity"...


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Old 08/12/2018, 04:19 PM   #9
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The supplements usually are made of calcium chloride, magnesium chloride, and sodium carbonate or bicarbonate. The corals consume the calcium, magnesium, and carbonate, and leave the sodium and chloride in the tank. The effect can be measurable very quickly in a tank with a lot of calcification. A month is plenty of time.


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Old 08/12/2018, 04:31 PM   #10
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what kind of mag supplement are you dosing?


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