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I just tested my magnesium and it's at 1100. I ordered 2 part starter kit from BRS which includes a gallon magnesium kit. I used their calculator and it recommends to add the following for 110 gallon total system volume (tank and sump included) to get the magnesium to 1350.
Need: 2217.7 ml; 74.9 fl oz; 443.5 tsp
Does this sound right? Use more than half a gallon to bring the magnesium up to 1350? Also once brought to this level will it stay at this level for awhile? Just wanted to know in case I need to buy a backup supply.
Also what is the best/correct way to add the magnesium? Drip line over a number hours/days or just add all at the same time?
Thanks! 
John 
keep an eye on your tank salinity while adding that much mag. Also keep an eye on salinity over time. 2part causes salinity to creep up. If you are habitually low in Mg, you may want to consider another salt mix.
-Tony
"Are you out of your mind Tony, you know better than to mix Blood Sport and reefing."-Tuberider
"I need a Vanilla Ice to English translator 
"-Gresham
You think I can use it as topoff water? I use Seachem Reef salt. I'm not dosing 2 part just the magnesium only. My calcium is at 500 and kh is at 8. ph is at 8.4. Salinity is at 1.025.
John
I had the same issue with low MG for a while - using reefcrystals. I added MG to my CA reactor to help keep it up. But yes, it takes a TON of material to get it up just a little bit! To go from 1100-1350+ I did daily additions for about 2-3 weeks...
-Kyle
Once I get it at 1350 does it stay steady at that number for awhile or will it drop? 2-3 weeks is a loooonggg time.
Is it ok to put the magnesium bottle to my ATO or is it best just to drip it in?
John
Hey John,
I think it's the salt... I have the same issue with Seachen reef salt.
So I went to test the freshly mixed water and it is at that low level....
I'm just waiting for the bucket to finish and I'll probably be switching salt mix.
Roberto
Fremont, CA
Illuminata 57
Did you guys mix your salt well prior to mixing with water? I was having wacky params with seachem reef salt for a while then I found out it was best to mix the salt first for about 5 minutes before making up a new batch.
I think it's the salt... I have the same issue with Seachen reef salt.
So I went to test the freshly mixed water and it is at that low level....
I'm just waiting for the bucket to finish and I'll probably be switching salt mix.
Really? I'm not sure if it's the salt. Looking at this post it's 1450. This is the one of the most common salt I've seen in most LFS.
John
Roberto
Fremont, CA
Illuminata 57
I didn't even see Rommel's comment because he posted the same time as me. Haha! I didn't know you have to mix the salt first before putting it in the water. Learning something new everyday....
John
Yep. It takes a lot to bring MG back up once it drops. Doesn't surprise me at all. I would maybe spread it out over several days rather then just dumping the whole amount in at once.
Bryan
Burbingame, CA
My 180g Tank build and progress Link