Salt with LOW Mg???
 

Long story short (see my other posts) I need a salt with low Mg... any recomendations?

Ca, Alk and Mg levels for 20 different brands are listed here:

http://reefcentral.com/forums/showthread.php?t=1714505

My Instant Ocean pales have never come close to those Mg levels, so I'd take that chart with a grain of salt. :wink:

Just about every pail I have used of instant ocean has those numbers. It might not be the best salt around, but I have found them to be consistant the last couple years.

reef crystals is always low. high for the other two.

My mag is just a bit lower than whats listed on the chart, but all the other number are bang on when salinity is at 1.026 or 35ppm. Make sure you are using a refractor for checking the salinity level or it might not be accurate and of course it will vary according to salinity level.

sort of interesting seeing the relationship between Ca and Mg right out of the pail (i.e. salts with low Ca, low Mg).

I have found that the boxes of IO Reef Crystals is lower in everything compared to the pails.

every pail of IO I have ever had was around 1100 - 1150 mg tested with Elos.

reefers best has a low mg level

I want you IO salt. Last 4 pails have all been around 840 in mag

This has always been my readings as well.

Most of my pails of IO have tested calcium 380 ppm, alkalinity 11 dKH, magnesium 1150 ppm for years. I went through 4 pails of H2Ocean and it was 400, 8, 1200. That's using Elos for calcium and alkalinity, Salifert for magnesium.

Thanks for the replies guys... I think I'll go see if the only pet store in town has any IO... likely the best chance of finding it.

For the lowest magnesium in salt I have used was ATI. I think it was around 600-700 . I don't see it available in most LFS though.