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.

AquaWiz SET-UP Guide Video CLICK HERE

Setting up for dosing Alkalinity guide video CLICK HERE

Available in the UK from Reef Quest Ltd

Official UK distributor for AquaWiz controllers and accessories.