NT Labs Marine Lab KH Alkalinity Test Kit

NT Labs Marine Lab KH Alkalinity Test Kit

NT Labs Marine Lab KH Alkalinity Test Kit is a carbonate hardness (KH) test kit for marine aquariums, designed to help reef and saltwater keepers measure alkalinity accurately. It suits anyone who wants stable water conditions for fish, corals and other marine invertebrates.

Key Benefits

• Accurate carbonate hardness (KH) testing for marine aquariums
• Helps you keep alkalinity stable, which is essential for the health of fish and corals
• Measures the concentration of carbonates and bicarbonates in your aquarium water
• Supports pH stability, because KH reflects the water's ability to buffer against pH changes
• Easy to use, with clear, easy-to-follow instructions
• A colour change indicator makes the result simple to interpret

Why Test for KH?

Carbonate hardness is a measure of how well your water resists pH swings, so it underpins the stability of the whole system. It matters most for corals, which rely on stable alkalinity to build their calcium-based skeletons. Low KH can inhibit coral growth and cause stress, leaving corals more vulnerable to disease. Consistent carbonate hardness also helps keep pH steady, which supports coral health and the overall balance of your reef tank. Testing regularly lets you see where your levels sit and keep conditions steady for your livestock.

How to Use

• Follow the instructions supplied with the kit to carry out the test on your aquarium water.
• Read your result from the colour change indicator.

Suitable For

• Marine aquariums
• Reef tanks housing corals and other marine invertebrates
• Saltwater fish keepers who want to monitor alkalinity and support pH stability

What's Included

• Marine Lab KH Test Kit, with everything needed for precise testing and easy-to-follow instructions, including a colour change indicator for reading results

Frequently Asked Questions

What does this test kit measure?
It measures carbonate hardness (KH) in marine aquarium water. That means the concentration of carbonates and bicarbonates, which determines how well the water buffers against pH changes.

Why is KH so important in a reef tank?
Corals rely on stable alkalinity to build their calcium-based skeletons. Low KH can inhibit coral growth and stress them, making them more vulnerable to disease.

How do I read the result?
The kit uses a colour change indicator, so you interpret the result from the colour change by following the supplied instructions.

Will testing KH help with pH stability?
Yes. KH is the water's buffering capacity against pH changes, so monitoring it helps you keep conditions consistent. Consistent carbonate hardness helps maintain stable pH.

Is this kit meant for marine or freshwater tanks?
It is a Marine Lab kit made for measuring KH in marine aquariums, including reef set-ups with corals and other marine invertebrates.

Do I need anything else to run the test?
The kit includes everything needed for precise testing, along with clear instructions.

When can I expect delivery?

• Gauteng (Jhb/Pta) - 1-3 working days
• Nationwide (Cpt/Dbn+) - 2-5 working days
• Outlying Areas - 3-7 working days

All orders are sent via Economy Road, typically through Fastway or Internet Express Couriers*. Estimated timeframes are not guaranteed. Once the order is collected by the courier, we have no control over third-party logistics and cannot make any time promises.

If you prefer a faster 🚀 shipping option, we also offer The Courier Guy during checkout in the dropdown selection. Please note that this option is not free, and you must choose it to use it. Please pay careful attention to the cutoff times and delivery timeframe for these options during checkout.

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No more waiting at home or at work for your delivery. Simply choose a collection locker or pickup point and collect your order when it suits you.

Delivery times to lockers and pickup locations typically range from 2–7 working days, depending on your location.*

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Collection timeframes:

• Bob Box: Collect within 2 days of receiving your collection notification.
• PUDO Lockers: Collect within 36 hours of receiving your collection PIN or SMS notification.

If a PUDO parcel is not collected within 36 hours, it will automatically be transferred to the nearest PUDO Kiosk or Depot at no additional cost. The parcel will then be held there for approximately 2 days before being returned.

Please ensure you collect your parcel within the applicable collection period. Uncollected parcels will be returned to the sender, and additional shipping charges may apply should the order need to be resent.