--- product_id: 12258121 title: "Magnesion Ionic Magnesium for Reef Aquariums, 500 ml" brand: "brightwell aquatics" price: "HK$226" currency: HKD in_stock: true reviews_count: 9 url: https://www.desertcart.hk/products/12258121-magnesion-ionic-magnesium-for-reef-aquariums-500-ml store_origin: HK region: Hong Kong --- # 500 ml high-concentration ionic magnesium Free from organics like EDTA & gluconate Maintains 1,290-1,320 ppm magnesium balance Magnesion Ionic Magnesium for Reef Aquariums, 500 ml **Brand:** brightwell aquatics **Price:** HK$226 **Availability:** ✅ In Stock ## Summary > 🌊 Elevate Your Reef’s Pulse with Pure Ionic Power! ## Quick Answers - **What is this?** Magnesion Ionic Magnesium for Reef Aquariums, 500 ml by brightwell aquatics - **How much does it cost?** HK$226 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/12258121-magnesion-ionic-magnesium-for-reef-aquariums-500-ml) ## Best For - brightwell aquatics enthusiasts ## Why This Product - Trusted brightwell aquatics brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Pure & Clean Formula:** Zero unwanted organics ensures a healthy, uncontaminated aquatic environment. - • **Proudly American-Made Quality:** Crafted in the USA with premium materials for consistent reef vitality. - • **Optimized Reef-Building Support:** Enhances aragonite formation, vital for coral and clam skeletal strength. - • **Precision Ionic Magnesium Boost:** Delivers a potent 500 ml dose to stabilize reef tank chemistry flawlessly. - • **Scientifically Engineered Excellence:** Formulated from empirical data by marine microbiologists for proven results. ## Overview Brightwell Aquatics Magnesion is a 500 ml high-concentration ionic magnesium solution designed to maintain optimal magnesium levels (1,290-1,320 ppm) in reef aquariums. Free from organic contaminants, it supports essential aragonite formation for coral and clam health. Developed through rigorous scientific research and proudly made in the USA, this conditioner ensures precise, effective reef water chemistry management for vibrant aquatic ecosystems. ## Description Brightwell Aquatics MAG250 Magnesion Liquid Salt Water Conditioner Elevate your reef aquarium's health with Brightwell Aquatics magnesium solution, a highly concentrated ionic compound formulated by marine scientists for aquarium water treatment. This aquarium water conditioner provides a potent dose of magnesium, regulating the delicate balance between calcium and carbonates in aquarium water. Crucial for reef-building organisms, magnesium is a key component of aragonite, the mineral responsible for skeletal material formation in corals, clams, and allies. Outclassing competitors, our solution is stronger, ensuring unparalleled effectiveness. It contains no unwanted organics like EDTA, gluconate, or polygluconate, offering a pure and focused solution. With a magnesium concentration recommendation of 1,290-1,320 ppm, achieve the perfect balance for immediate positive results in calcium supplementation. Understanding the unique requirements of each aquarium, our solution allows for precise dosing tailored to your setup's magnesium uptake rate. We recommend using a quality salt mix for stable seawater parameters, providing a robust ionic foundation. Trust in Brightwell Aquatics' commitment to purity—our liquid water care supplements are made with purified water and high-purity materials. Formulated based on empirical data, our solutions prioritize observation and measurement over theory, ensuring a precise and effective formula for your aquarium's success. FEATURES AT A GLANCE Super strong solution to maintain a balance between calcium and carbonates No unwanted organic material Provides a potent dose of magnesium Developed based on empirical data, prioritizing observation and measurement Formulated utilizing extensive data compiled by microbiologists AMERICAN-MADE EXCELLENCE Trust in the quality and excellence of Brightwell Aquatics, an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently strive to deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium. ## Features - HIGH-CONCENTRATION IONIC MAGNESIUM SOLUTION - Magnesion Liquid Reef Salt Water Conditioner is a high-concentrate solution for maintaining the optimal balance in aquarium reef tanks. Magnesium salt regulates aquarium calcium and carbonate concentrations to prevent excessive inorganic precipitation - REEF-BUILDING ESSENTIAL - Our aquarium water conditioner is a highly-concentrated ionic magnesium solution that plays a vital role in the formation of aragonite, the skeletal material of reef-building organisms like coral and clams - FREE FROM ORGANIC MATERIAL - This aquarium water conditioner contains no unwanted organic material such as EDTA, gluconate, or polygluconate, providing a pure formula for your aquarium's well-being. A powerful solution, it effectively boosts the health and vitality of aquatic ecosystems - DIRECTIONS – Before use, shake the supplement well. Administer 5 ml (1 capful) every other day, or as necessary, to sustain magnesium levels between 1,290 - 1,320 ppm in 20 gallons of aquarium water. When employed this way, 250 ml treats up to 1,000 gallons (3,785 L) - AMERICAN-MADE EXCELLENCE – Brightwell Aquatics is an industry-leading brand committed to providing innovative and scientifically backed aquatic care products. Made in the USA, we consistently deliver advanced superior quality solutions to elevate the vibrancy and health of your aquarium ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B006OOOG42 | | Best Sellers Rank | #112 in Aquarium Water Treatments | | Date First Available | August 31, 2011 | | Item Model Number | MAG500 | | Manufacturer | TopDawg Pet Supply | | Product Dimensions | 1 x 1 x 1 inches; 1 Pounds | ## Product Details - **Brand:** Brightwell Aquatics - **Liquid Volume:** 17 Fluid Ounces - **Item Weight:** 16 ounces - **Item Form:** Liquid - **Manufacturer:** TopDawg Pet Supply ## Images ![Magnesion Ionic Magnesium for Reef Aquariums, 500 ml - Image 1](https://m.media-amazon.com/images/I/81Yftg8wsrL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Received on time, quality consistent. Very good product. *by on Reviewed in the United States May 24, 2026* It works great ### ⭐⭐⭐⭐⭐ Increase magnisium *by on Reviewed in the United States June 7, 2026* Works great for increasing magnesium in fish tank ### ⭐⭐⭐⭐⭐ Great product. *by on Reviewed in the United States December 3, 2025* This works very well. My tank loves it. The coral is very happy and it didn’t have any side effects. Very easy to use and doesn’t cloud the water like others do. Great value. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hk/products/12258121-magnesion-ionic-magnesium-for-reef-aquariums-500-ml](https://www.desertcart.hk/products/12258121-magnesion-ionic-magnesium-for-reef-aquariums-500-ml) --- *Product available on Desertcart Hong Kong* *Store origin: HK* *Last updated: 2026-07-11*