---
product_id: 59392549
title: "Reef Kalkwasser, 2 kg"
brand: "seachem"
price: "1002 zł"
currency: PLN
in_stock: true
reviews_count: 5
category: "Seachem"
url: https://www.desertcart.pl/products/59392549-reef-kalkwasser-2-kg
store_origin: PL
region: Poland
---

# Raises calcium by 24 mg/L per gallon Stabilizes pH at 8.3–8.4 without affecting alkalinity 99.9% pure calcium hydroxide Reef Kalkwasser, 2 kg

**Brand:** seachem
**Price:** 1002 zł
**Availability:** ✅ In Stock

## Summary

> 🌊 Keep your reef thriving with precision calcium control!

## Quick Answers

- **What is this?** Reef Kalkwasser, 2 kg by seachem
- **How much does it cost?** 1002 zł with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pl](https://www.desertcart.pl/products/59392549-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

- • **Compact & Long-Lasting:** 2 kg powder pack designed for consistent reef care across all life stages.
- • **Safe & Clean Application:** Use only the clear supernatant to avoid unwanted precipitates and keep your tank pristine.
- • **Ultra-Pure Calcium Boost:** Elevate your reef’s calcium levels with lab-grade purity for optimal coral growth.
- • **Effortless Dosing Formula:** Easily prepare saturated solutions for controlled, drip-feed calcium supplementation.
- • **Precision pH Stabilization:** Maintain a stable, healthy pH environment (8.3–8.4) without compromising carbonate alkalinity.

## Overview

Seachem Reef Kalkwasser is a premium 2 kg calcium hydroxide powder designed to safely increase calcium levels in reef aquariums. It raises calcium by 24 mg/L per gallon of saturated solution added, while stabilizing pH between 8.3 and 8.4 without impacting carbonate alkalinity. Ideal for drip dosing in top-off water, it ensures optimal coral health and growth with minimal maintenance.

## 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

Review: 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 |
| 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

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

## Customer Reviews

### ⭐ Review
*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.pl/products/59392549-reef-kalkwasser-2-kg](https://www.desertcart.pl/products/59392549-reef-kalkwasser-2-kg)

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*Product available on Desertcart Poland*
*Store origin: PL*
*Last updated: 2026-05-29*