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API GH and KH Test Kit

by API
4.5 out of 5 stars 198 customer reviews
| 10 answered questions

List Price: $8.99
Price: $5.09 & FREE Shipping on orders over $35. Details
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  • Liquid test for freshwater
  • Helps detect stress on fish caused by rapid pH shifts, the result of low KH levels
  • Contains clear instructions and glass tube(s)
15 new from $5.09 1 used from $8.99

$5.09 & FREE Shipping on orders over $35. Details In Stock. Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

  • API GH and KH Test Kit
  • +
  • API Freshwater Master Test Kit
  • +
  • Seachem Prime 500ml
Total price: $37.26
Buy the selected items together


Product Description

Tests tap water & freshwater aquariums for general hardness (GH) and carbonate hardness (KH).Helps prevent fish stress caused by rapid pH shifts, the result of low levels of KH.

Product Details

  • Product Dimensions: 2.8 x 1.6 x 5.1 inches ; 5.6 ounces
  • Shipping Weight: 4.8 ounces (View shipping rates and policies)
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item can be shipped to select countries outside of the U.S. Learn More
  • ASIN: B003SNCHMA
  • Item model number: 58
  • Average Customer Review: 4.5 out of 5 stars  See all reviews (198 customer reviews)
  • Amazon Best Sellers Rank: #1,400 in Pet Supplies (See Top 100 in Pet Supplies)

From the Manufacturer

Customer Reviews

Top Customer Reviews

Verified Purchase
At first I was a little hesitant to purchase this product because of the reviews, but this is very simple to use. Don't really know whats so difficult about this. Yes the Multi-Language instructions can be a little overwhelming, but just like one of the other reviews said, tear off the language you read and discard the rest. Other then that all you have to do is:
*Fill test tube to the white line
*squeeze ONE drop (only one drop at a time)
*cap and invert several times(Invert several times AFTER EACH drop)
Do this until you get a change of color in the water
for KH-Blue must change to Yellow
for GH-Orange must change to Green
After color change you must refer to the conversion chart on the back of the English part of the instructions
_______________________________________________________
Example: for me I got a color change for both GH & KH after 5 drops

so for me both GH & KH are at 89.5 ppm (parts per million)
Based on the GH table below I have Soft water.

General Hardness Table

0 to 4 dH 0 to 70 ppm Very Soft
4 to 8 dH 70 to 140 ppm Soft
8 to 12 dH 140 to 210 ppm Medium Hard
12 to 18 dH 210 to 320 ppm Fairly Hard
18 to 30 dH 320 to 530 ppm Hard
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Verified Purchase
OK, firstly, there is no "laminated color card" regardless of what the product page says. This is one of those tests where you add drops one-by-one until there is a color change in the test tube. The number of drops indicates the water hardness. Really easy unless you aren't skilled at counting. For my tank water, I had to count all the way to 5.

So, my tap water is incredibly hard, but my crusty shower head already evidences that. My aquarium, however, is just fine. Cool.

I bought this test kit to supplement the test strips that I'd been using. Sometimes you simply lose faith and need a bit of affirmation. This test kit did affirm that the test strips are just fine.
5 Comments 35 of 38 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
This has been really useful in checking out my GH/KH levels. In particular, the GH test was handy when raising my GH a little bit for my snails and mollies.

I know some have said the colors are hard to distinguish. I didn't find that to be true. The colors are pretty light, but as long as the tube is up against a white background it is pretty clear if the GH one is pale green or pale orange, or the KH one is blue or yellow. If you are mildly colorblind this might be rather hard.

Being a titration test, you basically add one drop, shake it, and look at the color. Repeat until it changes, counting drops. This is fine for me, but if you have very high hardness it might take a while to run the test. My tap is 7dGH and 5dKH, and I raise the GH to 10. 10 drops doesn't take too terribly long.
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I concur with all other reviews up until the date of this one. One reviewer seemed to give it 3 stars because of the awkwardness of the really long paper instructions. I can agree with this and my resolution was to cut off all languages I don't need! This reduces it by about half. Nothing else to say...it works and is well worth the investment.
1 Comment 24 of 25 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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I wanted a titration based test for hardness (for better accuracy than the test strip kits) and this was one of the few I found. I checked a local pet store and they didn't have hardness tests at all. The instructions are very clear, explaining the types of hardness and how to conduct the test. I found it very easy to use, except that my water is so hard it was off the scale in the instructions! I think the scale goes up to 12 or 13 drops and I was around 22 before I got the color change. But you can fairly easily extrapolate the scale to higher values.
1 Comment 23 of 26 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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You have to be very careful from where you buy. The GH test kit does have expiration dates on them, especially the gh does go bad after a year or so,the carbonate hardness tends to last a little bit longer. When you buy do make sure to look at the expiration dates they are in front of the bottle the last 4 numbers indicating month and year example(0216). There are some other makers that use a solution that does last longer so it depends on what quality you want long term. Hope this helps..........
3 Comments 14 of 15 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Verified Purchase
This is a necessary test kit if you are needing to modify your GH and/or KH for an aquarium.

While most people have hard water and wish to go to soft water, I live in an area with near zero hardness and must raise mine. I keep soft water fish though, so I do not want to modify the KH in order to keep my pH low. Thus, I use Seachem Equilibrium to give the GH a slight boost, from my source 1 dGH to a target of 3-4 dGH.

The tests work as a titration test. Which means you fill the vial to the line, then add drops. After each drop, you have to shake the vial and look for a color change. At the first hint of a color change, you're done. The KH is significantly easier to read than the GH, this is the only reason I took a star off. The number of drops it takes for the color to change is the degrees of hardness (dGH or dKH).

If you are only curious what your tap water is, but do not have the intention of actually changing the GH or KH ... just take a water sample to a fish/pet store and they'll test it for free saving you the expense of this kit.
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API GH and KH Test Kit
This item: API GH and KH Test Kit
Price: $5.09
Ships from and sold by Amazon.com
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