---
product_id: 394011482
title: "Reef Kalkwasser, 2 kg / 4.4 lbs"
brand: "seachem"
price: "€ 185.93"
currency: EUR
in_stock: true
reviews_count: 6
category: "Seachem"
url: https://www.desertcart.pt/products/394011482-reef-kalkwasser-2-kg-4-4-lbs
store_origin: PT
region: Portugal
---

# Maintains natural seawater calcium levels Raises pH without altering alkalinity 99.9% pure calcium hydroxide Reef Kalkwasser, 2 kg / 4.4 lbs

**Brand:** seachem
**Price:** € 185.93
**Availability:** ✅ In Stock

## Summary

> 🌟 Elevate your reef game with pure, powerful kalkwasser magic!

## Quick Answers

- **What is this?** Reef Kalkwasser, 2 kg / 4.4 lbs by seachem
- **How much does it cost?** € 185.93 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/394011482-reef-kalkwasser-2-kg-4-4-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

- • **Economical & Efficient:** A cost-effective solution that stretches your budget while delivering premium reef care results.
- • **Natural Seawater Balance:** Maintain authentic calcium concentrations that mimic natural ocean conditions—your reef’s secret weapon.
- • **Ultra-Pure Calcium Boost:** Experience crystal-clear reef water with 99.9% pure calcium hydroxide for optimal coral growth.
- • **Pro-Level Reef Maintenance:** Ideal for dedicated reef keepers who demand precision and purity in their top-off water treatments.
- • **pH Elevation Without Compromise:** Increase pH levels seamlessly while preserving carbonate alkalinity, ensuring a stable aquatic environment.

## Overview

Seachem Reef Kalkwasser is a premium-grade calcium hydroxide powder designed to maintain natural seawater calcium levels and elevate pH without impacting carbonate alkalinity. Perfect for reef aquarists seeking a pure, economical, and effective solution to support coral health and water chemistry stability.

## Description

Reef Kalkwasser™ is a pure calcium hydroxide with unsurpassed purity and solubility characteristics. Calcium hydroxide is used to prepare limewater (kalkwasser) solutions that will maintain calcium concentrations at natural seawater levels. Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly. However, its capacity to perform these functions is dependent on evaporation rate and CO2 concentration. If these two factors are insufficient you can provide additional calcium with Reef Advantage Calcium™, Reef Complete™, or Reef Calcium™, and carbonate alkalinity with Reef Builder™ or Reef Carbonate™ (do not mix these directly with a kalkwasser solution). While Reef Kalkwasser™ is a high purity and economical limewater mix, the beginner, or someone with not as much time to devote to their system, may prefer to use other less involved methods for maintaining proper ionic concentration levels.

Review: Broken box - Broken container. All power everywhere, I have to clean up
Review: Corals seem happy, this will last a while.

## Features

- Very pure calcium hydroxide
- Ideal for increasing calcium in top-off water
- Increases pH with no impact on carbonate alkalinity

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0002A5WPG |
| Allergen Information | Yam Free |
| Batteries Included | No |
| Best Sellers Rank | #54,831 in Pet Supplies ( See Top 100 in Pet Supplies ) #487 in Fish Medication & Health Supplies |
| Color | white |
| Customer Reviews | 4.3 4.3 out of 5 stars (79) |
| Date First Available | 9 August 2012 |
| Item Form | Liquid |
| Item Weight | 2.27 Kilograms |
| Item model number | 399 |
| Number of Items | 1 |
| Pet Life Stage | All Life Stages |
| Product Dimensions | 20.32 x 20.32 x 19.05 cm; 2.27 kg |
| Quantity | 1 |
| Size | 2 kg/ 4.4 lb |
| Specific Uses | Active |
| batteries required | No |

## Product Details

- **Brand:** Seachem
- **Item form:** Liquid
- **Item weight:** 2.27 kg
- **Liquid volume:** 4 Liters
- **Manufacturer:** Seachem

## Images

![Reef Kalkwasser, 2 kg / 4.4 lbs - Image 1](https://m.media-amazon.com/images/I/61xyHTfQmFL.jpg)

## Customer Reviews

### ⭐ Broken box
*by J***O on 20 August 2023*

Broken container. All power everywhere, I have to clean up

### ⭐⭐⭐⭐⭐ Review
*by C***E on 19 August 2022*

Corals seem happy, this will last a while.

### ⭐⭐⭐⭐⭐ Review
*by R***A on 25 November 2025*

This stuff makes your reef rock! I always run this in my top off water. If your having trouble with your LPS, they love this stuff and grow like weeds when you run it.

## Frequently Bought Together

- Reef Kalkwasser, 2 kg / 4.4 lbs
- Instant Ocean Reef Crystals Reef Salt, Formulated Specifically For Reef Fish Tank Aquariums
- ESV B-Ionic Calcium Buffer System, 2-part Calcium and Alkalinity Maintenance Kit for Salt Water Coral Reef Aquarium, 2-Gallon

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**Shop now:** [https://www.desertcart.pt/products/394011482-reef-kalkwasser-2-kg-4-4-lbs](https://www.desertcart.pt/products/394011482-reef-kalkwasser-2-kg-4-4-lbs)

---

*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-03-13*