A Simple Way to Boost Calcium, Alkalinity & pH

Looking for an easier way to maintain stable parameters without jumping into a full calcium reactor setup?

The Reef Octopus KS150 Kalk Reactor is one of the simplest and most effective ways to improve calcium, alkalinity, and pH all with minimal equipment and maintenance.

What Is a Kalk Reactor? (Simple Explanation)

A kalk reactor mixes kalkwasser (calcium hydroxide) with fresh water from your ATO (auto top off system).

As water evaporates from your tank:

• Your ATO replaces it
• The reactor adds kalkwasser automatically

Result:

• Calcium added
• Alkalinity supported
• pH naturally increases

All without daily dosing.

Why Choose a Kalk Reactor?

Simple setup
Low maintenance
No CO₂ tanks required
Helps raise pH naturally
Great stepping stone before a calcium reactor

What It Helps With

• Low pH issues
• Maintaining calcium and alkalinity
• Reducing daily dosing
• Improving coral growth stability

Key Features

• Fully automated mixing chamber
• Designed to integrate with ATO systems
• Durable acrylic construction
• Compact footprint for sump setups
• Efficient kalkwasser mixing for consistent output
• Reliable performance for long term use

Ideal For

• Nano to medium reef tanks
• Mixed reefs and beginner SPS systems
• Hobbyists looking for a simple dosing solution
• Anyone not ready for a calcium reactor

How It’s Used

1. Add kalk powder to the reactor
2. Connect to your ATO system
3. As water evaporates, kalkwasser is dosed automatically

 Set it and let it run

Requirements (Sold Separately)

To operate this kalk reactor, you will need:

• Auto Top Off (ATO) system
• Kalkwasser (calcium hydroxide powder)
• Feed pump
• Control timer (for mixing cycles)

Specifications

• Rated for Aquariums up to 210 Gallons
• Footprint: 7.68" x 7.68"
• Body Diameter: 6"
• Height: 26"

Pro Tip

For best results, monitor alkalinity and pH regularly and adjust kalk concentration as needed.

Pairing a kalk reactor with stable evaporation and consistent ATO use will maximize performance.

Warranty

Backed by a 1-Year Manufacturer Warranty

Not sure if a kalk reactor or calcium reactor is right for your tank? Reach out we’re happy to help you choose the best setup.

Why Shop with Infinity & Beyond Aquatics?

At Infinity & Beyond Aquatics, we're more than an online aquarium store—we're hobbyists who understand the importance of quality equipment and dependable service. Every product we offer is carefully selected from trusted manufacturers to help you build and maintain a thriving aquarium with confidence.

When you shop with us, you'll enjoy:

• Authorized Dealer for Premium Aquarium Brands
• Genuine Products Backed by Manufacturer Warranties
• Carefully Curated Selection for Freshwater & Saltwater Aquariums
• Fast Order Processing
• Responsive Customer Support from Fellow Aquarists
• Secure Checkout & Trusted Shipping Partners
• Whether you're just getting started or maintaining an advanced aquarium, we're committed to providing the products and support you need for long-term success.

Shipping Information

We take great care to ensure your order is packaged securely and shipped safely. Shipping rates are calculated at checkout based on your location, order size, and selected shipping method.

Orders of $100 or more qualify for FREE Standard Shipping (exclusions may apply to oversized, freight, or specialty items).

Most in-stock orders are processed within 1–2 business days. If an item ships directly from one of our trusted supplier partners, processing and delivery times may vary slightly. You'll receive tracking information as soon as your order is on its way.

Our goal is to get your aquarium supplies to you quickly, safely, and ready for your next project.