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ATI Essentials 1 Supplement for Reef Aquariums - 5 Liter


We no longer carry this item.

ATI Essentials is the intelligent way to dose calcium, magnesium, carbonates, and trace elements. Find out why in this Reef Hacks review.


ATI Essentials is a complete support system that is easily tuned to the needs of your reef aquarium. In addition to calcium, magnesium and carbonates, ATI Essentials includes all of the necessary trace elements to support the biology of a reef tank.

Bottle Sizes

The ATI Essentials Set is comprised of 3 bottles and is available in 2 sizes:

  • 500 mL Concentrate Bottles
    Mixes 5 Liters of each ATI Essentials component
  • 1000 mL Concentrate Bottles
    Mixes 10 Liters of each ATI Essentials component

Preparation View Quick Start Guide

  • ATI Essentials #1 - Carbonate Sources
    ATI Essentials # 1 is a dry powder that includes various carbonate sources.


Mixing the solutions for dosing is easy although the instructions vary slightly for the different bottle sizes so pay close attention to the instructions before you begin.

In short, ATI Essentials #1 is mixed with RO/DI water until clear then stored in a food safe container (like HDPE plastic). ATI Essentials #2 and #3 are prepared the same way.

What You`ll Need

  • Reverse osmosis deionized water (preferably filtered through dual DI canisters)
  • 3 mixing containers
  • 3 storage/dosing containers in 5, 10, or 20 liters (1.5, 2.5, or 5 gallon sizes)

Recommended but not required


You begin by dosing ATI Essentials #1, #2, and #3 in equal amounts. For example, if you dose 10 mL of #1 per day, you will also dose 10 mL of #2 and 10 mL of #3 per day. But first you need to determine the starting dose and there are various possibilities.

If you already know your daily KH/alkalinity consumption, the optimal dosage can be worked out from the following formula: 36 mL of ATI Essentials increases KH/alkalinity in 100 liters (26.4 gallons) of aquarium water by 1° KH. Once you know how much of ATI Essentials #1 to dose, you will dose the same amount of #2 and #3 per day.

If you are already dosing a KH balancing solution using this recipe — 420 g NaHCO3 in 5 liters (1.32 gallons) or 840 g NaHCO3 in 10 liters (2.64 gallons) — you should dose the same amount of ATI Essentials as you did with your previous solution.

It is extremely important to measure your KH/alkalinity on a daily basis when you begin dosing ATI Essentials so that you can fine-tune the dosage.

If you have never dosed your aquarium before using ATI Essentials, please follow these guidelines:

New aquariums and/or tanks with few corals 5 mL of ATI Essentials per 100 L (26.4 gallons)
Soft corals and anemones 10 mL of ATI Essentials per 100 L (26.4 gallons)
A mixed reef with SPS, LPS, and soft corals 25 mL of ATI Essentials per 100 L (26.4 gallons)
A SPS dominant tank 50 mL of ATI Essentials per 100 L (26.4 gallons)

Much more detailed information about dosing is included in the instructional manual, such as what to do if you have an uneven consumption of calcium and alkalinity.

The Results

With the balanced formulation of ATI Essentials, performing partial water changes to correct water chemistry or compensate for trace elements are no longer completely necessary. The benefits of this will be visible in the health and growth of your corals.

The Advantages

  • All essential elements are supplied and fully balanced
  • Fully measurable and controllable dosing for complete stability
  • Carbonate (KH/Alkalinity), Calcium, and Magnesium can be individually adjusted
  • You’ll get better results with more growth and eye-popping colors
  • Regular water changes may no longer be necessary
  • Less water changes means you’ll save time and money

ATI Lab and ATI Elements

Let ATI do the math and chemistry for you! Get complete water quality analysis with ATI Lab mail-in water testing service. Use the results to fill in any gaps with ATI Elements to achieve optimal coral health.

To keep your reef tank parameters stable and at ideal levels, we recommend using the ATI DP-6 Dosing Pump to automatically dispense your ATI Essentials and Elements supplements.

Manufacturer Info

ATI is a German based company that specializes in high quality T5 lighting products as well as a line of skimmers and aquarium filter media. Their T5 bulbs and fixtures have become one of the more popular brands of reef enthusiasts.

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UZ18002 ATI Essentials 1 Supplement for Reef Aquariums - 5 Liter // ATI OutOfStock 8.95 USD 0.0 0