---
product_id: 6522025
title: "Seachem Reef Kalkwasser 250gram"
brand: "seachem"
price: "AR$64649"
currency: ARS
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.ar/products/6522025-seachem-reef-kalkwasser-250gram
store_origin: AR
region: Argentina
---

# Boosts calcium levels precisely Raises pH without altering alkalinity 99.9% pure calcium hydroxide Seachem Reef Kalkwasser 250gram

**Brand:** seachem
**Price:** AR$64649
**Availability:** ✅ In Stock

## Summary

> 🌊 Elevate your reef game with pure, precise calcium power!

## Quick Answers

- **What is this?** Seachem Reef Kalkwasser 250gram by seachem
- **How much does it cost?** AR$64649 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/6522025-seachem-reef-kalkwasser-250gram)

## 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

- • **pH Perfected:** Elevate your aquarium’s pH naturally without disturbing carbonate alkalinity balance.
- • **Coral Vitality Maximizer:** Supports vibrant coral health by delivering essential calcium in a controlled, safe manner.
- • **Ultra-Pure Calcium Boost:** Ensure crystal-clear reef water with 99.9% pure calcium hydroxide for optimal coral growth.
- • **Precision Top-Off Solution:** Ideal for daily top-off water adjustments, maintaining stable reef chemistry effortlessly.
- • **Effortless Reef Maintenance:** Simplify your reef care routine with a product trusted by professionals for consistent results.

## Overview

Seachem Reef Kalkwasser is a premium 250g calcium hydroxide powder designed to increase calcium levels in aquarium top-off water. It raises pH effectively without impacting carbonate alkalinity, making it an essential tool for maintaining stable, healthy reef environments.

## 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.

## Features

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

## Product Details

- **Brand:** Seachem
- **Liquid Volume:** 4 Liters
- **Item Weight:** 0.3 Kilograms
- **Item Form:** Powder
- **Manufacturer:** Seachem Laboratories, Inc.

## Images

![Seachem Reef Kalkwasser 250gram - Image 1](https://m.media-amazon.com/images/I/71tGcn6+6zL.jpg)

## Available Options

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

## Questions & Answers

**Q: How do you kill aiptaisa with this?**
A: Simply pour some kalkwasser with a pipette on top o it. Beware some people have reported mixed results, with aiptaisa splits and reproduction after kalkwasser. You can also kill aiptaisa by hitting it with the same gel glue you use for your corals/plugs.

**Q: Ok so I much of the solution would I use as a daily dose on a 26 gallon aquarium? 5 mL like the liquid?**
A: Read the dosage requirements on the back of the product container. I have a 100 gallon Reef tank with tropical fish corals and anemones. I only use two table spoons to raise my calcium level in one day. I do this daily or every other day until i reach my 400 ppm color match on the calcium chart. You need to find out what your calcium level is before using this product or you will kill your fish.

**Q: Is it 1 teaspoon or 2 per gallon? I am confused.**
A: Kalkwasser's max saturation is 2 teaspoons per gallon. Using more means it's essentially wasted. It is recommended that you start at 1 teaspoon (or less) per gallon and test your water, to make sure you don't create huge spikes in pH and alkalinity, or excess in calcium. Test as needed and increase if appropriate.

**Q: What’s the difference in this and reef complete?**
A: Kalkwasser ("limewater" in German) is a concentrated solution of calcium hydroxide that has a high pH and will let you supplement calcium and alkalinity and maintain a high pH in your reef aquarium. Reef complete is Calcium Chloride, together with Magnesium and Strontium, that will allow you to maintain adequate levels of these, but you still may need to add carbonate alkalinity (Reef builder) separately. I use kalkwasser through my ATO and supplement magnesium separately.

## 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.

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

Very good 👍

### ⭐⭐⭐⭐⭐ You will need a container to supply tank
*by A***R on September 18, 2025*

Use with auto top off

## Frequently Bought Together

- Seachem Reef Kalkwasser 250gram
- Polyp Lab Nano Reef-Roids Coral Food - 37g
- All Seas Marine 050-28 SLB Splmt Replenisher 1/2# Blk

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-02-22*