300 g, 600 g, 1.2 kg, 4.8 kg, 24 kg Overview • High-purity powdered
• Provides magnesium, which helps regulate the balance between calcium
and carbonates in aquarium water, and is a component of aragonite, the
mineral secreted by reef-building organisms to form skeletal material.
• Stronger and more economical than liquid magnesium solutions; created
for hobbyists maintaining multiple reef aquaria.
• Formulated by a marine scientist.
Magnesium plays a vital role in reef aquaria: it helps maintain calcium
and carbonate (composing the majority of measurable alkalinity)
concentrations by limiting unwanted inorganic precipitation with each
other. In the absence of adequate magnesium ions, calcium and carbonate
ions bond rapidly, depleting their concentrations in the system and
creating the false impression that heavier supplementation is required
to re-establish the desired concentrations. No matter how much calcium
is added, its natural seawater concentration of 412 ppm will never be
sustained until the magnesium concentration begins to approach 1,290
ppm. Once the balance between calcium and magnesium has been
established, subsequent calcium supplementation yields immediate
positive results. Keeping magnesium within a range of 1,290-1,320 ppm
will maintain the desired balance, and provides enough of the element
to reef-building organisms for the formation of aragonite (~0.10% Mg by
Instructions and Guidelines
Basic: Dissolve 2.5 grams (~½ teaspoon) of product per 20 US-gallons of
aquarium water in 8-fl. oz. of fresh water; add every other day or as
needed to maintain the magnesium concentration within a range of 1,290
- 1,320 ppm. When used in this fashion, 1,200 g treats up to 9,600
US-gallons (36,340 L).
Advanced: Create a stock solution by dissolving 20 grams (~4 teaspoons)
of Magnesion-P in 8-fl. oz. of fresh water (preferably purified); each
ml of the solution will increase magnesium concentration (”[Mg2+]”) in
1 US-gallon (3.785 L) of water by 6.0 ppm. [Reference: Each g of
Magnesion-P will increase the [Mg2+] in 1 US-gallon (3.785 L) of water
by 114.4 ppm.] If initial [Mg2+] in the aquarium is below 1,288 ppm,
add stock sol’n at maximum rate of 10 ml per 20 US-gallons daily until
desired [Mg2+] is attained, then dose daily or weekly as needed (see
below). Maintain [Mg2+] within a range of +/-10 ppm. Once desired
[Mg2+] has been acquired, measure aquarium's [Mg2+] at the same time
each day over a one- to two-week period to determine the daily rate of
magnesium uptake (i.e. the decrease in magnesium). To determine daily
dosing rate (preferable to weekly dosing): estimate volume of water in
entire aquarium system (US-gal.); divide the daily decrease in [Mg2+]
by 6.0; multiply this number by volume of water in system to obtain
daily ml of stock sol’n required to maintain stable [Mg2+].
Caution: Keep out of reach of children. Not for human consumption.
Guaranteed Analysis (by weight)
Magnesium (min) 43% (430,000 ppm)
Magnesium sulfate (anhydrous), Magnesium chloride (anhydrous)