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.