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Reef Advantage Magnesium" is a concentrated (80,000 ppm) optimized blend of  magnesium, chloride, and sulfate salts designed to restore depleted levels of  magnesium with minimal impact to the ionic ratios found in natural sea water. 
 
 Why It's Different
 Reef Advantage Magnesium" contains no ammonia. This is a common contaminant in  every liquid magnesium supplement on the market.
 
 Severely depleted levels of magnesium (below 800 mg/L) can cause depressed pH  levels and an inability to maintain proper calcium levels. The most frequent  causes of magnesium deficiency are use of kalkwasser, frequent overdosing of a  carbonate additive, or low levels in the salt mix itself. Kalkwasser, for  instance, precipitates magnesium as magnesium hydroxide while excess carbonates  precipitate it as magnesium carbonate. In both cases, this means that magnesium  that was present in the water is now unavailable. Of the two, magnesium  hydroxide and magnesium carbonate, the former is more problematic; it is  extremely insoluble. Once magnesium has precipitated as magnesium hydroxide, it  will never redissolve. Magnesium carbonate will redissolve; however, it does so  slowly. So, while it will go back into solution, there will be a significant  portion of time in which magnesium levels are depleted. 
 
 Directions
 BEGINNER: Use 5 g (1 level teaspoon) per 80 L (20 gallons*) twice a week.  Dissolve in at least 250 mL (1 cup*) of freshwater. ADVANCED: Check magnesium  level, then follow addition regimen above until magnesium is adjusted to  1200—1350 mg/L. Each 5 g/80 L will raise magnesium by about 5 mg/L. Amount or  frequency can be adjusted, but do not exceed 25 g/80 L per day. Thereafter, use  as required to maintain magnesium. EXPERT: After determining the magnesium  depletion rate, set up a continuous drip system. Use the following formula to  determine how much to add to your top-off water: g=vm/80 (g=grams to add to top  off water, v=volume of tank in liters, m=amount to raise magnesium in mg/L). For  example, if you want to raise magnesium by 10 mg/L in a 200 liter tank, then you  would add (200x10)/80=25 g into the top-off water. [For reference: 1 gallon*=3.8  liters, 5 g=1 teaspoon*]. HINTS: Use the Reef Status" Magnesium, Carbonate &  Borate to check magnesium levels.
 
 DO NOT OVERDOSE: Excess magnesium may enhance the loss of carbonate alkalinity.  Do not directly mix with any carbonate supplement. Best if magnesium & carbonate  additives are added on alternate days or at least 30 minutes apart. Slight  clumping of this product may be encountered but does not impact its use; any  clumps will break up very easily.