---
product_id: 428046432
title: "Reef Advantage Magnesium, 1.2 kg / 2.6 lbs"
brand: "seachem"
price: "€ 128.57"
currency: EUR
in_stock: false
reviews_count: 5
category: "Seachem"
url: https://www.desertcart.pt/products/428046432-reef-advantage-magnesium-1-2-kg-2-6-lbs
store_origin: PT
region: Portugal
---

# Treats 4,000 gallons per kg No ammonia contamination 80,000 ppm concentrated blend Reef Advantage Magnesium, 1.2 kg / 2.6 lbs

**Brand:** seachem
**Price:** € 128.57
**Availability:** ❌ Out of Stock

## Summary

> 🌟 Elevate your reef’s health with pure, powerful magnesium magic!

## Quick Answers

- **What is this?** Reef Advantage Magnesium, 1.2 kg / 2.6 lbs by seachem
- **How much does it cost?** € 128.57 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/428046432-reef-advantage-magnesium-1-2-kg-2-6-lbs)

## Best For

- seachem enthusiasts

## Why This Product

- Trusted seachem brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Trusted by Pros:** Seachem’s proven formula with 4.6-star rating from 156 reef enthusiasts
- • **Pure & Clean Formula:** Zero ammonia contamination ensures safer, healthier reef environments
- • **Ionic Balance Maintained:** Minimal disruption to natural seawater ionic ratios for stable aquarium chemistry
- • **High-Efficiency Treatment:** 1.2 kg treats up to 19,200 gallons, perfect for large reef tanks
- • **Precision Magnesium Boost:** Restores depleted magnesium with a scientifically optimized blend for reef vitality

## Overview

SeaChem Reef Advantage Magnesium is a highly concentrated, ammonia-free blend of magnesium, chloride, and sulfate salts designed to restore essential magnesium levels in reef aquariums. It treats large volumes efficiently while maintaining natural seawater ionic balance, supporting optimal pH and calcium stability for thriving coral ecosystems.

## Description

SeaChem 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. 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. Magnesium depletion is commonly associated with the use of kalkwasser. 1 kg treats 16,000 L (4,000 gallons).

Review: Works🤷🏽‍♂️like it should
Review: Consigliato - Confezione integra, prodotto arrivato prima del previsto, prezzo conveniente. Per chi ha acquari grandi la confezione da 1.2 kg è l'ideale. Consigliato

## Features

- Raises magnesium and contains no ammonia
- A concentrated optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium
- Minimal impact to the ionic ratios found in natural sea water
- Contains no ammonia, a common contaminant in every liquid magnesium supplement on the market
- 300 grams treats 1200 US gallons

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B001F0MMBO |
| Allergen Information | Abalone Free |
| Brand | Seachem |
| Brand Name | Seachem |
| Customer Reviews | 4.6 out of 5 stars 156 Reviews |
| Global Trade Identification Number | 00000116063708 |
| Item Form | Liquid |
| Item Weight | 1.11 kg |
| Liquid Volume | 250 Millilitres |
| Manufacturer | Seachem Laboratories, Inc. |
| Target Species | Reef |
| UPC | 000116063708 |
| Unit Count | 1 Count |
| country-of-origin | USA |

## Product Details

- **Brand:** Seachem
- **Liquid Volume:** 250 Millilitres
- **Item Weight:** 1.11 kg
- **Item Form:** Liquid
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Reef Advantage Magnesium, 1.2 kg / 2.6 lbs - Image 1](https://m.media-amazon.com/images/I/816lzqkEJKL.jpg)
![Reef Advantage Magnesium, 1.2 kg / 2.6 lbs - Image 2](https://m.media-amazon.com/images/I/91-uAZ63PFL.jpg)

## Questions & Answers

**Q: is this something I can use for my hydroponics system?  (vs. Epson Salt)**
A: It’s the same basic thing as epsom salt, just without any anti-caking agents in it.

**Q: Is this safe for freshwater planted tanks?  My calcium is much higher then magnesium and would like to increase it.**
A: Honestly, I'm not sure.  I'm a salt water guy, but I do know that you should not add buffers of any kind unless you know that they are needed. If you know what the Magnesium levels are supposed to be, you could probably use this product to correct your Mag levels, but I wouldn't do anything unless I spoke to someone at my local fish store.  Be careful!

**Q: Is it supposed to have bigger chunks in the container?**
A: There’s no anti-caking agents in it so clumps can happen. Just shake the container to break up the clumps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works🤷🏽‍♂️like it should
*by E***D on 8 November 2025*



### ⭐⭐⭐⭐⭐ Consigliato
*by S***O on 8 February 2019*

Confezione integra, prodotto arrivato prima del previsto, prezzo conveniente. Per chi ha acquari grandi la confezione da 1.2 kg è l'ideale. Consigliato

### ⭐⭐⭐⭐⭐ Old results
*by M***. on 3 March 2023*



## Frequently Bought Together

- Seachem Reef Advantage Magnesium, 1.2 kg
- Seachem Reef Advantage Calcium, 500 g

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**Shop now:** [https://www.desertcart.pt/products/428046432-reef-advantage-magnesium-1-2-kg-2-6-lbs](https://www.desertcart.pt/products/428046432-reef-advantage-magnesium-1-2-kg-2-6-lbs)

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-04-01*