AquaWiz KH Controller™ (Gen 4)

The KH controller reefkeepers are talking about.

Reagent-free. Reliable. Smart.

The AquaWiz KH Controller™ (Gen 4) is the device reefkeepers everywhere are turning to for accurate, automatic carbonate-hardness control — without bottles of reagents or daily testing.
It measures and (optionally) maintains your KH automatically, keeping your reef stable while you enjoy it.

Why reefkeepers choose AquaWiz

• Reagent-free operation – No test solutions to buy, store, or dispose of.

• Integrated dosing control – Built-in pump automatically adds alkalinity solution to maintain your target KH.

• Automatic recovery – Resumes normal operation after a power outage.

• KH-to-pH BNC output – Connects to external systems such as Neptune Apex or GHL Profilux, allowing KH-derived data to appear directly in your controller dashboard.

• Dedicated pH electrode included – Ready to use; no additional calibration step required.

• Electrode-health monitoring – Detects aging and provides timely replacement reminders.

• Email notifications – Alerts you if readings drift outside your chosen range.

• Flexible measurement schedule – Intervals adjustable from 1 to 6 hours via the web interface.

ΔpH analysis feature

AquaWiz checks how well your system manages CO₂ and gas exchange by comparing your pH to its ideal, fully-aerated level — giving an easy indicator of aeration efficiency and overall water-chemistry stability.

Specifications

• Power supply: 12 V 1 A (UK/EU standard)

• Measurement interval: 1 – 6 hours (adjustable)

• KH precision: ± 0.05 dKH

• KH → pH output accuracy: ± 0.01

• Reservoir capacity: 20 oz (≈ 0.6 L)

• Tubing: 3 mm ID / 5 mm OD

• Dimensions: 18 × 18 × 19 cm

Firmware upgrade

Gen 3 AquaWiz controllers can be upgraded to the latest Gen 4 firmware.
Owners can contact AquaWiz directly with their device’s serial number to receive the update — ensuring they benefit from the newest features and performance improvements.

Quick look AquaWiz SET-UP Guide Video CLICK HERE

Setting up for dosing Alkalinity guide video CLICK HERE

Latest full set-up guide from Parker’s Reef video guide CLICK HERE

Note we recommend following Aquawiz’s own instructions CLICK HERE and App download

Available in the UK from Reef Quest Ltd

Official UK distributor for AquaWiz controllers and accessories

Dealer enquiries welcomed