API GH & KH Test Kit Combo

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  • Measures Dissolved Minerals in Water
  • Quickly and Accurately Reads GH and KH Levels
  • Easy to Read Instructions

The API GH and KH test kit tests the levels of carbonate hardness and general hardness in the aquarium. KH or carbonate hardness in high enough levels prevents pH from changing rapidly and maintains a healthy system. GH or general hardness is a measurement of how many dissolved minerals are present in your water. Depending on the fish being kept would determine how much hardness should be present in the water. Guppies, Mollies, Platies, Swordtails, Goldfish, African Cichlids and more like high mineral content as it matches their natural habitat. Ensure proper levels of both KH and GH in your aquarium with this test kit.

Customer Reviews

Based on 65 reviews
Marilynn C. (Honolulu, HI, US)
Buffering & GH test

As a new fish keeper (almost!), I was using the Aquarium Co-Op test strips to check the water parameters as I was cycling my first tank and was surprised to find a fairly low KH reading … so to not harm my future fish, I decided to order the API liquid test to double check and was impressed that both methods yielded the same result. Gave me confidence to go ahead. I would definitely recommend both products.

stanford t. (Mililani Town, HI, US)
Great test kit.

Easy to use.

Brian P. (Phoenix, AZ, US)

This helped me find out what my GH & KH is exactly. I did have to watch a couple of YouTube videos to know exactly how to use it.

Bryan R. (Riverside, CA, US)
Does what it says with the API quality you can trust

Pretty easy way to test your water’s GH/KH parameters. My only complaint is it can be a bit time consuming due to having to cap and shake vial after each individual drop. I’m not sure how you’d get around that. Maybe I don’t need to recap it with the included cap (one of which is much smaller and more difficult to get on and off than the other) and I can just use my finger? I’ve been worried that would influence my results but I’ll give it a shot and see if I can get away with it…

Anyways, product works as intended and is a vital component in making sure my shrimp and snails stay healthy.

Chris g. (Hedgesville, WV, US)
Thumbs up

Works as described