Deltec KM500S Kalkwasser Stirrer for Large Reef Aquariums

The Deltec KM500S Kalkwasser Stirrer is a high-performance calcium and alkalinity supplementation solution designed for large reef aquariums. Kalkwasser (limewater) is produced by dissolving calcium hydroxide in RO water, creating a highly alkaline solution rich in calcium and carbonate ions essential for coral growth and skeletal formation.

Because kalkwasser reacts quickly with atmospheric CO₂, it must be mixed and stored in an airtight environment. The KM500S provides the ideal sealed system, continuously producing fresh kalkwasser while preventing degradation. This stirrer is capable of supplying up to 10 litres per hour, making it suitable for aquariums up to 6700 litres.

Designed for use alongside an automatic top-up system, the KM500S gravity-feeds kalkwasser back into the aquarium or sump. Its low-power motor, compact footprint, and reliable construction make it a trusted solution for serious reef keepers maintaining demanding SPS-dominated systems.

Key Features:

• Produces fresh kalkwasser in an airtight environment
• Suitable for reef aquariums up to 6700 litres
• Output of up to 10 litres per hour
• Supports stable calcium and alkalinity levels
• Designed for use with automatic top-up systems
• Can be installed externally next to sump or aquarium
• Gravity-fed return for safe and consistent dosing
• Low power consumption (7.5V, 3 watts)
• Supplied with 500ml RowaKalk

The Deltec KM500S Kalkwasser Stirrer is an efficient and dependable solution for maintaining calcium and alkalinity in large reef aquariums. With its airtight design, reliable kalkwasser production, and compatibility with auto top-up systems, it offers long-term stability for demanding reef systems. Available now at Reef freaks.