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Neptune Trident Marine Aquarium Water Analyzer
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* Programmable automatic titration colorimeter for Neptune Systems Apex or ApexEL electronic aquarium controller
* Accurately test marine aquarium alkalinity, calcium, and magnesium levels and displays results on your smart device
* Use in conjunction with the Neptune DOS dosing system to automatically adjust dosing levels based on test results

Automate and modernize routine testing of aquarium alkalinity, calcium, and magnesium levels. The Neptune Systems Trident Marine Aquarium Water Analyzer is a self-contained programmable titration colorimeter that automatically tests alkalinity, calcium, and magnesium levels and then displays and charts the test results on your smart device. User-friendly plug and play design of the Neptune Systems Trident Marine Aquarium Water Analyzer allows you to set up and start testing aquarium alkalinity, calcium and magnesium levels in under 15 minutes. Simply plug in one cable, two tubes, and run the setup task on the Apex Fusion mobile app that walks you through the installation with helpful videos. No more reagents to mix, tubes to cut, or pumps or probes to calibrate!

Employ Trident Controlled Dosing when you configure the Neptune Trident Marine Aquarium Water Analyzer with the Neptune Systems DOS Dosing & Fluid Metering System (LA#95879). If test results from the Neptune Trident Marine Aquarium Water Analyzer deviate from your set alkalinity, calcium, and magnesium levels, Trident Controlled Dosing will gradually increase or decrease the amount of additives your DOS delivers to maintain ideal alkalinity, calcium, and magnesium levels.

The Neptune Trident Marine Aquarium Water Analyzer measures 4-1/4” x 12” x 10” high and includes a Trident Marine Aquarium Water Analyzer unit, 1Link cable (US/CAN only), 5ft length of black sample line tubing, 5ft length of clear waste line tubing, 1-month reagent supply, Calibration Fluid, and Get Started Card.

Additional replacement Neptune Trident Reagents available separately.

For use with the Neptune Systems Apex (LA#99218) or Neptune Systems ApexEL (LA#109928) electronic aquarium controller.


  • Apex or ApexEL (not Apex Classic, Lite, or Jr.)
  • Available 1Link port or 24v power supply and Aquabus Cable (available separately)
  • External waste container or drain
  • Must be located within 4ft of water source to be tested

Highlighted Features

  • Automatically tests seawater for Alkalinity, Calcium, and Magnesium
  • Up to 24 Alkalinity tests per day with +/-0.05 dKh precision
  • Up to 12 Calcium tests per day with +/-15 ppm precision
  • Up to 12 Magnesium tests per day with +/-15 ppm precision
  • ~7.9ml sample water used per parameter tested
  • ~7 minutes testing time per parameter tested
  • Up to one month of testing before reagents need changing based on base level testing of 4-Alk, 2-Ca, 2-Mg per day.
  • When combined with DOS system (available separately), the data from Trident can be used to automatically raise or lower the amount of additive dosed as necessary to maintain stability at user set point.

How it Works
On a scheduled basis the Neptune Trident Marine Aquarium Water Analyzer carefully mixes its reagents with a small amount of sample water from your aquarium. While doing this, the Trident is measuring (titrating with a precision peristaltic pump) the amount of reagent necessary to reach an expected color change (determined by the electronic colorimeter). When it finishes the titration, The Trident sends the sample/reagent fluid to your waste container. The Neptune Trident Marine Aquarium Water Analyzer then interprets the results of that test and logs the value into your Apex.

Out of Range Actions and Alerts
You can set up your Apex to alert you or take immediate action(s) when a parameter falls outside of the safe zone you specify. As just one example, you might be dosing an Alkalinity solution and a misconfiguration could lead to overdosing of your aquarium. The Trident will catch that, alert you, and give you more time to make that correction to save your aquarium before it’s too late. The data from the Trident can also be used to turn on and off other devices (like dosers or solenoids) to protect your aquarium even more.

Simple, Infrequent Reagent Changes
When using the default testing schedule of four (4) alkalinity, two (2) calcium, and two (2) magnesium tests a day, the reagent stored inside the Trident will last a full month. Adding new reagent is super simple - just slide out the drawer, remove the old bottle(s), and replace them with new ones. If you desire, you can also run a calibration with the included calibration standard.

Automatic Dosing Control (ADC) – Ultimate Stability
When configured on your Apex, ADC will take the test results it receives from the Trident and uses the data to gradually turn up or down the amount of additive your DOS delivers. Simply set your target value and your starting dosing amount and the ADC will only tune that dosing level +/-35%. If it takes more than that amount of dosing to keep your aquarium at your target value, then the Apex will stop ADC, revert to your starting dosing amount and alert you that you need to manually adjust your dosing level. Then, ADC can be reenabled and it will continue to guide your DOS so that it keeps you as close to your target value as possible.

It is possible to use ADC for all three tests – Alkalinity, Calcium, and Magnesium. You can also use one test value to adjust up or down more than one additive delivered by the DOS (i.e. Triton system).

Customer Testimonials