Test Kit: Alkalinity
G2865
The Waterbox Alkalinity Test Kit provides fast and accurate measurement of carbonate hardness (dKH) in saltwater aquariums. Alkalinity is essential for maintaining stable pH and supplying the carbonate ions corals...
Or build it into a bundle — save up to 6% ↓What it is, and who it is for.
The Waterbox Alkalinity Test Kit provides fast and accurate measurement of carbonate hardness (dKH) in saltwater aquariums. Alkalinity is essential for maintaining stable pH and supplying the carbonate ions corals need to build strong calcium carbonate skeletons. Proper levels help prevent rapid pH swings, support healthy coral calcification, and contribute to overall system balance.
Keeping alkalinity within the recommended 7.5–9.5 dKH range ensures consistent growth, stable water chemistry, and long-term reef vitality. Regular testing alongside calcium and magnesium helps maintain a balanced and thriving environment. Each kit provides enough reagents for roughly 80–100 individual tests.
Each kit provides enough reagents for roughly 80–100 individual tests.
Build around the Test Kit: Alkalinity.
It's already in your system below. Add the flow, filtration and dosing around it and the discount starts working — tiers climb as the build grows, and the reef meter fills with it.
Pick the right one, not the biggest one
The honest line-up from test kits. Most buyers reading this page should buy the middle column.
Test Kit: Magnesium
Test Kit: Alkalinity
JBL ProAquaTest Freshwater Test SetAsked before checkout
The questions our support inbox actually gets.
Does it ship quickly?+
Orders placed before 2 PM ET on a business day leave the same day. Tracking is emailed the moment the label prints.
What if it's the wrong fit for my tank?+
Return it. 30 days, no restocking fee, refund to the original payment method. Better: tell us your tank first and we'll spec the system for free — half of all returns are sizing problems.
Who handles the warranty?+
We do. Everything carries the manufacturer's warranty and we run the claim for you — one email to us instead of a ticket queue.
How does the bundle discount work?+
Add items in the bundle builder: 2+ items saves 5%, 3+ saves 8%, 4+ saves 12%, and 5+ saves 15% off the whole system, applied at checkout.