---
product_id: 59392453
title: "Reef Kalkwasser, 500 g"
brand: "seachem"
price: "£28.45"
currency: GBP
in_stock: true
reviews_count: 13
category: "Seachem"
url: https://www.desertcart.co.uk/products/59392453-reef-kalkwasser-500-g
store_origin: GB
region: United Kingdom
---

# Boosts calcium & pH without altering alkalinity Precise dosing for stable reef chemistry 99.9% pure calcium hydroxide Reef Kalkwasser, 500 g

**Brand:** seachem
**Price:** £28.45
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef game with precision calcium power!

## Quick Answers

- **What is this?** Reef Kalkwasser, 500 g by seachem
- **How much does it cost?** £28.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/59392453-reef-kalkwasser-500-g)

## 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

- • **Balanced Chemistry Boost:** Increases calcium and pH levels without disrupting carbonate alkalinity—perfect for delicate ecosystems.
- • **Pure Power for Your Reef:** Ultra-pure calcium hydroxide ensures optimal reef growth and vitality.
- • **Customizable Dosing Control:** Easily dissolve and dose to maintain ideal water parameters with precision.
- • **Trusted by Reef Enthusiasts:** Highly rated and relied upon by professionals for consistent aquarium health.
- • **Safe Handling, Superior Results:** Formulated for effective use with clear instructions to protect you and your aquatic life.

## Overview

Seachem Reef Kalkwasser is a premium 500g calcium hydroxide powder designed to safely and effectively increase calcium and pH levels in reef aquariums without impacting carbonate alkalinity. Trusted by aquarists for maintaining stable water chemistry, it supports vibrant coral growth and overall reef health.

## Description

Product Description Seachem Reef Kalkwasser 500G Ingredients calcium hydroxide 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); }); }); Directions Dissolve 5 g of Reef Kalkwasser in 100 mL of distilled water. Add this solution to the aquarium gradually, mixing well. Perform regular calcium tests and adjust dosage as needed. Avoid direct sunlight exposure and keep out of reach of children and pets. Box Contains water treatment See more

Review: Does what it says - Does what it says
Review: 5 star as always with seachem - I use seachem products daily. Cannot go wrong with this brand when it comes to your saltwater aquarium.

## Features

- Causes serious eye damage.
- Causes skin irritation.
- May cause respiratory irritation.
- 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 | B0002A5WOW |
| Allergen Information | Yam Free |
| Batteries Included | No |
| Batteries required | No |
| Best Sellers Rank | 52,810 in Pet Supplies ( See Top 100 in Pet Supplies ) 550 in Aquarium Water Treatments |
| Colour | clear |
| Customer Reviews | 4.6 4.6 out of 5 stars (433) |
| Date First Available | 18 Nov. 2009 |
| External Testing Certification | Não aplicável |
| Item Form | Powder |
| Item Weight | 431 g |
| Item model number | 116039703 |
| Number of Items | 1 |
| Pet Life Stage | All Life Stages |
| Pet Type | Fish |
| Product Dimensions | 20.32 x 9.4 x 9.14 cm; 431 g |
| Quantity | 1 |
| Size | 500 g (Pack of 1) |
| Specific Uses | Kalkwasser solutions maintain calcium directly and carbonate alkalinity indirectly. |

## Product Details

- **Brand:** Seachem
- **Item form:** Powder
- **Item weight:** 0.43 Kilograms
- **Liquid volume:** 2 Litres
- **Manufacturer:** Seachem

## Images

![Reef Kalkwasser, 500 g - Image 1](https://m.media-amazon.com/images/I/81maDbpKu0L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Does what it says
*by G***R on 30 August 2025*

Does what it says

### ⭐⭐⭐⭐⭐ 5 star as always with seachem
*by J***G on 11 May 2025*

I use seachem products daily. Cannot go wrong with this brand when it comes to your saltwater aquarium.

### ⭐⭐⭐⭐⭐ Great
*by O***K on 1 April 2025*

Perfect

## Frequently Bought Together

- Seachem Reef Kalkwasser 500gram
- Polyp Lab Nano Reef-Roids Coral Food - 37g
- Seachem Reef Complete 500ml

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**Shop now:** [https://www.desertcart.co.uk/products/59392453-reef-kalkwasser-500-g](https://www.desertcart.co.uk/products/59392453-reef-kalkwasser-500-g)

---

*Product available on Desertcart United Kingdom*
*Store origin: GB*
*Last updated: 2026-05-24*