Neptune ATK Automatic Top-Off Kit

Reliable, Automated Water Top-Off for Aquariums

The Neptune ATK (Automatic Top-Off Kit) is a complete, plug-and-play solution for replacing water lost to evaporation. Designed to eliminate the hassle of daily topping off and to safeguard against overfills, the ATK keeps your aquarium’s salinity stable while protecting your tank, home, or business from water disasters.

Why Choose Neptune ATK?

Water evaporation is a constant challenge for aquarium owners, and overfilling can lead to serious issues. Unfortunately, many ATO devices on the market are built with subpar components and minimal protection.

The Neptune ATK stands apart — combining three layers of redundant safety protection with the convenience of easy installation and smart control.

Key Features

• No More Manual Topping Off

• Leave Home for Days Without Worry

• Maintain Consistent Salinity Levels

• 3 Layers of Disaster Prevention

• Installs in Under 5 Minutes

• Operates as Standalone or with Apex Controller

Triple Redundant Safety Protection

1️⃣ Backup Optical Sensor

A second optical water level sensor acts as a fail-safe if the primary sensor is compromised, automatically shutting off the pump and triggering an alarm.

2️⃣ IQ-Fill Run-Time Intelligence

This smart algorithm learns your tank’s typical top-off volume and limits pump run times. If both sensors fail, it will prevent excessive water addition.

3️⃣ Mechanical Float Valve

As the final layer, a physical float valve halts water flow if both electronic failsafes malfunction — protecting your aquarium and floor.

Benefits of the Neptune ATK

• Plug-and-Play Design — No mounts to assemble or wires to splice

• Works Standalone (No Apex Required)

• Additional Advanced Features When Connected to an Apex

• PMUP 24V Pump Included — Pumps water up to 14 feet vertically

• Audible Alarm for Immediate Failure Notification

• Daisy-Chain with Apex AquaBus for Full Integration

Apex Owners: Unlock More Features

When connected to any Neptune Apex system, the ATK setup is just as simple — and you gain:

• Email, text, or iOS alerts during emergencies

• Integration into your Apex Fusion dashboard

• Automated control alongside other tank operations

Intelligent IQ-Fill Top-Off Algorithm

In standalone mode, IQ-Fill learns your tank’s water replacement patterns over time and calculates a safe maximum run-time for each fill. This dramatically reduces risk of overfilling and water damage.

High-Powered PMUP Top-Off Pump

The included PMUP utility pump is one of the most powerful ATO pumps available:

• 24V vertical pump design

• Fits most water jugs or ATO reservoirs

• Pumps water over 14 feet vertically — ideal for remotely located water storage