ATI Essentials SPS Reef #2 - 2.7 Liter

Part Two (Calcium Complex) only of the ATI Essentials SPS two-part dosing system.

ATI Essentials SPS is a concentrated, ready-to-use two-part dosing system formulated for fast growth, bold coloration, and optimal metabolic function in SPS-dominated reef aquariums. Developed using insights from tens of thousands of ICP lab tests, this modern system ensures a precise balance of major and trace elements while maintaining stable water chemistry, without the risk of accumulation. Its pH-boosting, inorganic alkalinity source makes it ideal for demanding SPS corals.

• Comprehensive Dosing
• Coral Growth and Vibrancy
• High pH Stabilization
• Balanced Dosing
• Trace Element Support
• Highly Concentrated
• Simplified Maintenance
• Ready to Use

Comprehensive Dosing

Delivers 28 key elements, including calcium, magnesium, alkalinity, and 25 trace elements essential for coral health. This comprehensive approach prevents imbalances and supports long-term reef stability.

Coral Growth and Vibrancy

Promotes robust skeletal growth and intense coloration, optimizing the health of your entire reef ecosystem, including small polyp stony (SPS) and large polyp stony (LPS) corals.

High pH Stabilization

Contains only inorganic alkalinity sources that help maintain a higher, more stable pH, which is especially important for sensitive SPS corals.

Balanced Dosing

Provides boron, calcium, potassium, magnesium, strontium, and other major elements in a 1:1 dosing ratio. Supports customized dosing based on your tank's consumption, helping maintain ionic balance and prevent parameter shifts

Trace Element Support

Delivers essential trace elements such as iodine, iron, lithium, manganese, molybdenum, vanadium, and others, engineered to support coral coloration and growth without unwanted buildup.

Highly Concentrated

Each 2,700ml bottle delivers 27,000 °dKH of alkalinity and 200,000 mg of calcium. Approximately 3.6 times more concentrated than traditional Balling two-part systems.

Simplified Maintenance

Replace complex, multi-bottle dosing routines with a streamlined two-part system. Replenishes consumed elements efficiently, reducing the need for water changes when nutrient levels are stable.

Ready to Use

Pre-mixed and dosing pump–ready. No need to dilute or manually prepare. Just connect and dose.

Available in Two Versions

For additional information, please visit ATINorthAmerica.com.

Essentials Mixed Reef

• Ideal for: Aquariums with medium to high fish stocking and higher nutrient levels.
• Alkalinity Source: Both organic and inorganic
• Concentration: ~5× Balling
• pH Effect: Medium to strong pH stabilization
• Nutrient Reduction: Yes

Essentials SPS 

• Ideal for: Aquariums with low to medium fish stocking and lower nutrient levels.
• Alkalinity Source: Inorganic only
• Concentration: ~3.6× Balling
• pH Effect: Strong to very-strong pH stabilization
• Nutrient Reduction: No

Help Me Choose the Best Formula for My Tank

Specifications

• How Much to Use: Link to Dosing Calculator
• Max Daily Dose: No restrictions
• Recommended Usage: For SPS aquariums and mixed reef aquariums with low nutrient levels; for the best results, use with ATI ICP Labs and ATI ICP Elements
• Available Sizes: 2.7 Liters
• Form: Liquid
• Concentration (Part #1 KH): 10,000° dKH per L; one bottle contains 27,000° dKH of alkalinity
• Concentration (Part #2 Calcium): 74,000 mg per L; one bottle contains 200,000 mg of calcium

What's Included (i.e., what’s in the box)

1. ATI Essentials SPS Reef #2 Calcium Complex - 2.7 Liter