---
product_id: 6522018
title: "Seachem Reef Kalkwasser 500gram"
brand: "seachem"
price: "13.55 OMR"
currency: OMR
in_stock: true
reviews_count: 13
category: "Seachem"
url: https://www.desertcart.com.om/products/6522018-seachem-reef-kalkwasser-500gram
store_origin: OM
region: Oman
---

# 500g for hundreds of gallons Raises pH without altering alkalinity 99.9% pure calcium hydroxide Seachem Reef Kalkwasser 500gram

**Brand:** seachem
**Price:** 13.55 OMR
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef game with pure, powerful kalkwasser!

## Quick Answers

- **What is this?** Seachem Reef Kalkwasser 500gram by seachem
- **How much does it cost?** 13.55 OMR with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.om](https://www.desertcart.com.om/products/6522018-seachem-reef-kalkwasser-500gram)

## 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

- • **Long-Lasting Supply:** A single 500g jar supports months of dosing, making it a cost-effective reef essential.
- • **Effortless Calcium Boosting:** Easily prepare limewater solutions that keep calcium levels at natural seawater standards.
- • **pH Stability Without Compromise:** Increases pH gently while preserving carbonate alkalinity for a balanced reef environment.
- • **Precision Dosing for Optimal Growth:** Drip dosing method ensures steady calcium and alkalinity balance, perfect for serious reef keepers.
- • **Unmatched Purity for Crystal Clear Reefs:** Seachem Reef Kalkwasser delivers ultra-pure calcium hydroxide to maintain pristine water chemistry.

## Overview

Seachem Reef Kalkwasser is a premium 500g calcium hydroxide powder designed to maintain natural seawater calcium levels and stabilize pH without impacting carbonate alkalinity. Ideal for reef aquariums, it supports long-term water chemistry balance through precise limewater dosing, ensuring vibrant coral growth and tank 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).

Review: Works well - I'm only dosing about 250 ml of kalk per day into my 164 gal majority LPS reef, spread out evenly over 12 doses. But even at that small amount, I've seen great stability in my calcium, alkalinity, and pH. This stuff works well, and it's very cost effective. This jar will literally last me more than 9 months. Worth it to spend a bit more for a pure, high quality product, as opposed to food grade pickling lime.
Review: Goes a long way - Maybe a tablespoon for 2 gallons. This container is good for hundreds of gallons. I use it as a PH buffer at water change. The PH of your tank is the PH of your tap water so I make sure I at least put in water in the low to mid 8's. I add one cup clear Kalkwasser per gallon or 2 of water change water. You can also verify salinity at the same time and just pour it all in the tank. You will not hurt anything.

## 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 | B0002A5WOW |
| ASIN  | B0002A5WOW |
| Age Range Description | all stages |
| Best Sellers Rank | #44,908 in Pet Supplies ( See Top 100 in Pet Supplies ) #439 in Aquarium Water Treatments |
| Brand Name | Seachem |
| Color | white |
| Customer Reviews | 4.7 4.7 out of 5 stars (446) |
| Date First Available | June 15, 2004 |
| Date First Available  | June 15, 2004 |
| Department | All Ages |
| Department  | All Ages |
| Directions | Never add this product directly to the tank. Add 3 g (1 teaspoon) to 4 L (1 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 gallon). Drip this solution into tank. Monitor pH and carbonate alkalinity. Adjust rate of addition to maintain a stable pH (8.3&ndash;8.4). Notes: Adding 4 L (1 gallon) of a saturated kal… |
| Included Components | all |
| Is Discontinued By Manufacturer  | No |
| Item Dimensions LxWxH | 8 x 3.7 x 3.6 inches |
| Item Package Dimensions L x W x H | 8.03 x 3.74 x 3.7 inches |
| Item Weight | 0.43 Kilograms |
| Item model number | 116039703 |
| Item model number  | 116039703 |
| Manufacturer | Seachem Laboratories, Inc. |
| Manufacturer  | Seachem Laboratories, Inc. |
| Material | Cotton |
| Model Name | Reef Kalkwasser 500g |
| Number of Items | 1 |
| Product Dimensions  | 8 x 3.7 x 3.6 inches; 15.2 ounces |
| Size | 500 grams |
| Specific Uses for Product | Active |
| Target Audience Keyword | fish |

## Product Details

- **Brand:** Seachem
- **Item Form:** Powder
- **Item Weight:** 0.43 Kilograms
- **Liquid Volume:** 2 Liters
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

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

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works well
*by D***. on May 30, 2023*

I'm only dosing about 250 ml of kalk per day into my 164 gal majority LPS reef, spread out evenly over 12 doses. But even at that small amount, I've seen great stability in my calcium, alkalinity, and pH. This stuff works well, and it's very cost effective. This jar will literally last me more than 9 months. Worth it to spend a bit more for a pure, high quality product, as opposed to food grade pickling lime.

### ⭐⭐⭐⭐⭐ Goes a long way
*by W***S on June 29, 2020*

Maybe a tablespoon for 2 gallons. This container is good for hundreds of gallons. I use it as a PH buffer at water change. The PH of your tank is the PH of your tap water so I make sure I at least put in water in the low to mid 8's. I add one cup clear Kalkwasser per gallon or 2 of water change water. You can also verify salinity at the same time and just pour it all in the tank. You will not hurt anything.

### ⭐⭐⭐⭐⭐ Very good 👍
*by V***� on May 3, 2025*

Very good 👍

## Frequently Bought Together

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

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*Product available on Desertcart Oman*
*Store origin: OM*
*Last updated: 2026-02-22*