The ELOS Mg kit is relatively complicated compared to most. You really do two separate tests, then apply some math to get your answer.
Test 1:
Take a 3ml water sample and titrate using Part A until colour changes from red-orange to green. Count the drops. (for me, this is typically about 33-35 drops)
Test 2:
Clean/rinse the test vial; Take a new 3ml water sample.
Add 5 drops of Part B. Mix 30 seconds
Add one small spoonful (.15ml) of Part C powder. Mix shortly.
Titrate using Part D until you see colour change from pink-violet to light-blue. Count the drops. (for me, this is typically about 5-6 drops)
Math:
Subtract the # of drops in Test 2, from the # of drops on Test 1...and multiply by 50 to get your answer in ppm Mg. (34-5) = 29; 29x50 = 1450ppm
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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