---
product_id: 59392549
title: "Seachem Reef Kalkwasser, 2 kg"
brand: "seachem"
price: "€ 240.37"
currency: EUR
in_stock: true
category: "Seachem"
url: https://www.desertcart.hr/products/59392549-seachem-reef-kalkwasser-2-kg
store_origin: HR
region: Croatia
---

# Saturates 4 L water for precise dosing Raises calcium by 24 mg/L per gallon 2 kg ultra-pure calcium hydroxide Seachem Reef Kalkwasser, 2 kg

**Brand:** seachem
**Price:** € 240.37
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef game with precision and purity!

## Quick Answers

- **What is this?** Seachem Reef Kalkwasser, 2 kg by seachem
- **How much does it cost?** € 240.37 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/59392549-seachem-reef-kalkwasser-2-kg)

## 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 Reef Care:** Preferred by pros to maintain vibrant, healthy coral ecosystems
- • **Pure & Safe Formula:** Ultra-pure powder minimizes impurities for crystal-clear water
- • **pH Stability Champion:** Raises pH to optimal 8.3–8.4 without altering carbonate alkalinity
- • **Precision Calcium Boost:** Easily increase tank calcium with exact dosing for thriving reefs
- • **Easy-to-Use Saturated Solution:** Dissolve measured powder in water for controlled drip feeding

## Overview

Seachem Reef Kalkwasser is a premium 2 kg calcium hydroxide powder designed to safely and effectively increase calcium levels in aquarium top-off water. It raises pH to an ideal 8.3–8.4 without impacting carbonate alkalinity, ensuring stable water chemistry for coral health. The product requires dissolving measured amounts in water to create a saturated solution for controlled dosing, making it a trusted choice for professional reef aquarists.

## Description

Product Description Seachem Reef Kalkwasser 2K Directions Never add this product directly to the tank. Add 3 g (1 teaspoon) to 4 L (1 US gallon) of water and mix to dissolve. If using pure water, a fully saturated solution is prepared by adding 6 g (2 teaspoons) to 4 L (1 US gallon). Drip this solution into tank. Monitor pH and carbonate alkalinity. Adjust rate of addition to maintain a stable pH (8.3–8.4). Notes: Adding 4 L (1 US gallon) of a saturated kalkwasser solution to 150 L (40 US gallons) will raise calcium by 24 mg/L. Always use the clear supernatant (top solution) only and do not allow undissolved material to enter the aquarium. Keep this container tightly closed when not in use and minimize solution/air contact to avoid calcium carbonate formation/precipitation. P.when('A').execute(function(A) { A.on('a:expander:toggle_description:toggle:collapse', function(data) { window.scroll(0, data.expander.$expander[0].offsetTop-100); }); }); Box Contains water treatment See more

## 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 |
| Best Sellers Rank | 269,072 in Pet Supplies ( See Top 100 in Pet Supplies ) 2,084 in Aquarium Water Treatments |
| Brand Name | Seachem |
| Country Of Origin | United Kingdom |
| Customer Reviews | 4.4 4.4 out of 5 stars (79) |
| Global Trade Identification Number | 00000116039901 |
| Item Form | Powder |
| Item Type Name | Aquarium Conditioner |
| Item Weight | 5.01 Pounds |
| Liquid Volume | 4 Litres |
| Manufacturer | Seachem |
| Manufacturer Part Number | 399 |
| Model Number | 399 |
| Pet Type | Fish |
| Target Species | Fish |
| UPC | 000116039901 |
| Unit Count | 2000.0 gram |

## Product Details

- **Brand:** Seachem
- **Item form:** Powder
- **Item weight:** 5.01 Pounds
- **Liquid volume:** 4 Litres
- **Manufacturer:** Seachem

## Images

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

## 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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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-08-21*