Why is Magnesium required?
Magnesium is present in NSW (Natural Sea Water) in a fairly high concentration (1350 – 1500 mg/L). Magnesium is an essential part of chlorophyll, which is necessary for photosynthesis. Without photosynthesis algae and hence the corals, which we have in our aquariums, would not survive. Magnesium also has another important function in that it allows maintaining the correct combination of calcium concentration and alkalinity or carbonate harness possible. Maintaining a correct magnesium concentration is therefore very important and is indirectly responsible for fast coral and calcareous algae growth.
Magnesium is depleted by algae growth and also by the use of excessive Kalkwasser or by going far beyond natural calcium, alkalinity and pH values.
About Liquid Magnesium
This supplement is highly concentrated. Each liter contains approximately 25,000 mg of magnesium. To avoid an ionic imbalance, we properly balance the magnesium with ions such as sulfate, chloride, bromide, sodium and calcium.
All ingredients are of a pharmaceutical quality or even better. This ensures that no unwanted elements are added to your valuable aquarium.
This supplement in instead to be used on a regular maintenance basis. If the magnesium concentration is significantly lower than 1350 mg/L, we advise to use our Magnesium Powder. This powder is far more effective in raising the magnesium concentration yet is not ionically balanced to the extent of this supplement. The powder should there for be used as a one time major corrective measure.
Shake before use.
Dose 5 ml per 100 liters (25 gallons) once a week.
Adjust dosage according to individual requirements (use a magnesium test, e.g., Salifert’s Magnesium Profi-Test).
Ever 5 ml per 10 liters (2.5 gallons) will increase the magnesium concentration by approximately 12.5 mg/L(12.5ppm).
Never increase the magnesium concentration by more than 50 mg/L aday. Maintain a magnesium concentration of 1350 – 1500 mg/L.
Salifert is a Holland base company that produces top of the line test kits as well as tank additives and foods for marine and reef aquariums.
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 5-7 business days.
Over 90% of our members receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $4.99—or spend $199 and we’ll upgrade you automatically!
Expediated shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
Same-day shipping is available Monday-Friday for most products—place your order by 10 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
Learn More About Shipping
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
Learn More About Returns
Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!
- Most Products
Earn 5 reward points for every $1 you spend to get 5% cash back
- Marine Depot, AquaMaxx, Accel Aquatics, and Korallin
Earn 6 reward points for every $1 you spend to get 6% cash back
- Aqua Illumination, EcoTech Marine, Nano Box, Neptune Systems, NYOS, Oceanbox Designs, Pax Bellum, and Reef Glass
Earn 1 reward point for every $1 you spend to get 1% cash back
You can also get bonus reward points by purchasing select items during special sales and promotions.
Learn More About Rewards