Brightwell - Magnesion-P - 600g

Item ID : 183725650
Brightwell - Magnesion-P - 600g
Sale Price : RM 108.18
Coupon Code : Coupon-D111
5% Off
Shipping :
Peninsular :RM6Sabah, Labuan:RM8Sarawak:RM8
Combine Shipping allowed, Ship within 1-3 working days
Ship To : Within Malaysia, ship by Courier Services, Self Collect
Item at : Penang
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Available Qty : 1

Brightwell - Magnesion-P - 600g


  • Highly-effective alkalinity-increasing (”buffer”) powdered blend.
  • Helps increase pH stability in an aquarium by raising the alkalinity; continued addition raises pH until 8.3 is reached, at which point the pH remains unchanged and the alkalinity alone increases.
  • Provides a source of carbonates, which make up the majority by weight of aragonite, the mineral secreted by reef-building organisms as skeletal material.
  • Formulated by a marine scientist.
  • Determine alkalinity in aquarium with an accurate test kit prior to supplementing. Do not add this product directly to an aquarium without first diluting in water as directed.



300g | 600g |



Technical Background

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 weight).

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.



Magnesium sulfate (anhydrous), Magnesium chloride (anhydrous)


Buy with confidence, we have 322 Good Ratings from buyers!
Buyer: pi****   (0: 5+,100%)  |  Date: 28/9/2016 8:39  | Item ID:171517294
Buyer: pi****   (0: 5+,100%)  |  Date: 28/9/2016 8:39  | Item ID:182826804
Buyer: pi****   (0: 5+,100%)  |  Date: 28/9/2016 8:39  | Item ID:146756726
4.very good
Buyer: zh****   (0: 23+,100%)  |  Date: 27/9/2016 17:25  | Item ID:177293885
5.Excellent Seller. Thanks!
Buyer: jo****   (35: 61+,100%)  |  Date: 19/9/2016 11:57  | Item ID:177888490
6.Excellent Seller. Thanks!
Buyer: jo****   (35: 61+,100%)  |  Date: 19/9/2016 11:57  | Item ID:177888442
7.Keep updated through Whatsapp. Item arrived as promised.
Buyer: no****   (0: 1+,100%)  |  Date: 12/8/2016 6:27  | Item ID:171932076
8.Keep updated through Whatsapp. Item arrived as promised.
Buyer: no****   (0: 1+,100%)  |  Date: 12/8/2016 6:27  | Item ID:176728257
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Brightwell - Magnesion-P - 600g
RM 108.18 Shipping fee:Peninsular: RM 6, Sabah/Labuan: RM 8, Sarawak: RM 8,
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