Neptune Systems

Trident - Marine Aquarium Water Analyzer

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This item is available for purchase on backorder. Estimated to ship on 6/28/24.

Say Goodbye to Manually Testing for Calcium, Alkalinity, or Magnesium in your Reef!

The Trident is an automated testing system that regularly tests alkalinity, calcium, and magnesium in your saltwater aquarium — and then communicates this information to your Apex so you can get alerts, and change your dosing. When combined with the DOS (available separately) it creates a fully automated system for the proper dosing of supplements, maintaining them at consistent levels.

  • Automatically performs Calcium, Alkalinity, and Magnesium tests
  • Includes 1-month of reagent
  • Combine with Neptune DoS for automated dosing
  • Programmable alerts for out of range parameters
  • Data is graphed for easy to comprehend tank stats
  • Can be set-up and integrated with your Apex in less than 15 minutes
  • Empties used reagents and sample into an external vessel (not included)
  • Up to one month of testing before reagents need changing; based on 4-Alk, 2-Ca, 2-Mg tests per day


Note: Requires Neptune Apex or ApexEL with an open 1Link OR a 24V Power and Aquabus cable


How It Works

The Trident is a self-contained automatic titration colorimeter. That’s quite a mouthful, for sure, so let’s state it as simply as we can. The Trident is basically automating what you (and top scientists) do already when you test your water, that is, perform a color changing titration and interpret the results.

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


Easy Plug & Play Setup

From the box to testing in under 15 minutes! Unlike other testing systems, there are no reagents to mix, tubes to cut, or pumps or probes to calibrate. Simply plug in one cable, two tubes, and run the setup task on the Apex Fusion mobile app — it holds your hand through the installation with helpful videos along the way.


Consistency & Precision

The Trident tests with a precision of +/- 0.05 dKh for Alkalinity and 15ppm for Calcium and Magnesium. This is better than humans can do consistently with every hobby-grade test kit on the market.


Understand Your Reef Tank Like Never Before

When you start getting the regular data coming in from the Trident you will be amazed at the things you can see happening. The daily light cycle swing on calcium carbonate uptake. A salinity drop by watching magnesium. An out of sync dosing of calcium. This increased understanding ultimately helps you maintain a better, more successful reef.


Instant 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 tank. The Trident will catch that, alert you, and give you more time to make that correction before its too late and to save your aquarium. The data from the Trident can also be used to turn on and off other devices (like dosers or solenoids) to protect your tank even more.


Ultimate Stability with the Neptune DŌS

The more stable you maintain proper levels of Alkalinity, Calcium, and Magnesium, the better your corals will grow and thrive. But coral uptake of these supplements often changes and requires us not only to perform more testing but also seems to put us in a never-ending state of adjusting our dosing levels.

The Trident, when paired up with one or more of our DŌS systems solves this problem with Automatic Dosing Control (ADC)

When configured on the Apex, ADC will take the results it receives from the Trident and uses them to gradually turn up or down the amount of additive your DŌS delivers. But, don’t worry, we have built this feature with safety in mind. With ADC you set your target value and your starting dosing amount and 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 re-enabled and it will continue to guide your DŌS 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 DŌS (i.e. Triton system).


Simple 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 Apex will last a full month. And 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 session with the included calibration standard.

The cost of reagents and the recurring cost is a valid concern for a hobbyist considering the test kit or automated system – and we designed the Trident with that in mind – keeping those costs as low as possible. Reagent comes in 2-month kits (based on the default testing schedule of 4-Alk/2-Ca/2-Mg per day). These kits include two bottles of Reagent A (changed every month), one each of Reagent B and C (changed every two months), and one bottle of our calibration seawater sample. The reagent kit has at least 240 alkalinity tests and 120 tests each of Calcium and Magnesium. These two-month kits are priced at just $44.95 in the U.S.


Ultra-Quiet Testing

You will hear the Trident operate from time to time if you listen closely or you have a super-quiet room. And, as compared to other automated testing systems, it is several dB quieter. While inside your cabinet along with your other equipment, you will likely never even hear it.



  • Dimensions: 9.8" x 12.4" x 4.9"
  • Alkalinity Precision: +/-.05 dKh
  • Calcium Precision: +/-15 ppm 
  • Magnesium Precision: +/-15 ppm 
  • Testing Time: Around 7 minutes per test
  • Sample Water Required: Around 8mL per test
  • Max Head: Must be less than 4' from the water sample


What's Included?

1x Trident System

1x 1Link Cable

5' Black Sample Tubing

5' Clear Waste Tubing

1x 2-Month Reagent Supply*


*The included reagent is the actual 2-month reagent kit, however with initial setup of the Trident, a small amount of reagent will be used, which will result in about 45 days of reagent remaining (which can vary depending on how many times a day you test).


Note: Requires Neptune Apex or ApexEL with open 1Link OR a 24V Power Supply and Aquabus cable. Automatic dosing requires the use of the Neptune DoS Fluid Metering Module

More Information
UPC 653078004557
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Product Questions

Does the trident have a built in waste container? Or do you have to have a waste line running down into a drain near it for it to work properly?
Question by: matt van dyck on Sep 5, 2022, 3:47 PM
Hey there,
Thank you for reaching out to us. It does not come with a waste container. You can either have it near the drain or just going into a jug.

Please let me know if you need anything further and take care!
Answer by: Matt Lucero (BRS Staff) on Sep 9, 2022, 7:54 AM
Can you set the trident to test once a day or once every two days?
Question by: Karen on Aug 16, 2022, 4:21 PM
Thanks for reaching out to us! No the minimum number of tests for the Trident is 4 times a day in order to prevent sample water from drying out which can cause salt crystals to form and block the tubing inside the Trident. Please let us know if we can help with anything else!
Answer by: Kyle Thomas (BRS Staff) on Aug 17, 2022, 1:25 PM
Can the unit operate by itself? Do you need an Apex controller? I plan on using it as s sole monitor of Calcium, Alk, and Magnesium. I already have (a non-Apex) dosing system. I don't want to start over. But just need a Monitoring system. I currently check parameters with the Hanna Checkers. Please clarify if I need additional equipment or can it be used to only monitor? Thank you.
Question by: Quan Tran on Aug 16, 2022, 4:19 PM
Thanks for the questions! The Trident will only work with an Apex controller of some sort. I'd recommend at least the A3 Apex that comes with an EB832. Alternatively, you could do the A3 Apex Jr and get a 1 Link Module to connect the Trident to or purchase an AquaBus Cable and power supply for the Trident. Summarized below are the options for using the Trident.

1. Used with the A3 Apex Pro or A3 Apex by plugging included 1Link cable to EB832
2. Used with A3 Apex Jr with additional 1Link Module for connecting the Trident
3. Used with A3 Apex Jr with additional power supply and AquaBus Cable connected to the Trident
Answer by: Kyle Thomas (BRS Staff) on Aug 17, 2022, 2:08 PM
Will it work with the neptune apex jr?
Question by: Daniel ceron on Nov 20, 2021, 10:26 PM
This will not work with the Jr. or Classic.
Answer by: Matt Lucero (BRS Staff) on Nov 22, 2021, 9:48 AM
I read about a requirement to send in the Trident to Neptune for annual maintenance. I didn't see anything like that in the instructions or on the Neptune website... Is it true my Trident will have to be sent annually for maintenance?
Question by: Scott Claus on Jan 4, 2020, 9:48 PM
Hey there!

Neptune has said that there will be some program but there have not been any official announcements or details.

Take care
Answer by: Thomas Billington on Jan 5, 2020, 10:39 AM
How will these work with a calcium reactor?
Question by: Tracy Edwards on Jun 8, 2019, 7:49 PM
Hey there,
Great question! There is no formal wizard at this time that allows for the control of a calcium reactor (CaRx) with the Trident.

It is Neptune Systems opinion that a CaRx should handle 90% of your calcification needs and the additional 10% or so, can be modulated through liquid dosing. A Trident paired with a D?S can dynamically control that liquid additive for the delivering the most appropriate amount for the current rate of calcification.

With all that being said, there are certainly CaRx users that are using the Trident to control their CaRx. Visit the link below on the Neptune Systems Community Forum to see how and please let us know if you have any further questions. Happy Reefing!

Answer by: Mark Schlough on Jun 10, 2019, 1:51 PM
Now that these are out, (and I'm sure someone there grabbed one ;-), can you give me the size measurements? I'm rearranging things under my tank, and want to figure out how much space to leave for it.
Question by: Jeremy King on May 28, 2019, 12:05 PM
Hey there,
12" x 4 1/2" x 10" (L,W,H). Happy Reefing!
Answer by: Mark Schlough on May 29, 2019, 1:16 PM
Does the Trident work with the apexLE?
Question by: Jesus Lopez on May 8, 2019, 5:57 PM
Hey Jesus,
Thank you for reaching out to us. The Trident will work with the APEX EL.

Let us know if you have any further questions and take care!
Answer by: Matt Lucero on May 8, 2019, 6:06 PM
Any update on the release date?
Question by: Josh on Sep 7, 2018, 9:51 AM
Hey there!

Unfortunately we still do not have any update on the release. We are hoping for Black Friday or Christmas time!
Answer by: Thomas on Sep 7, 2018, 2:09 PM
I have the Apex Classic, if I purchase the new Apex Base Unit, is that all I’ll need to add this to my system?
Question by: Hunter on Jul 3, 2018, 11:23 PM
Great question!

If you replace your old head unit with the new Apex Base Unit you will be able to run the Trident when it comes out.
Answer by: Josh Cuta on Jul 5, 2018, 2:52 PM