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API GH and KH Test Kit
|Price:||$5.09 & FREE Shipping on orders over $35. Details|
|You Save:||$3.90 (43%)|
- 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)
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From the Manufacturer
API GH & KH TEST KIT
API has been an aquatics industry leader for over 50 years, and we are committed to developing the best products and solutions to simplify the care of aquariums and ponds.
GH & KH Test Kit
Water hardness is a measure of the dissolved mineral content of water. There are two types: the general hardness (GH) and carbonate hardness (KH).
When keeping freshwater fish and plants, the GH and the KH of aquarium water should match their natural habitat. The GH & KH TEST KIT helps aquarists duplicate the natural habitat of their fish, as well as detect low KH levels, which can lead to rapid and wide pH shifts, stressing fish.
Tip: KH can strongly influence pH. If you add a pH adjuster to your aquarium and the pH returns to its original level in a day or two, this is called “pH rebund” –and it is caused by high KH.
Very hard water can cause an ugly white crust (scale) to form on the hood, on glass walls, and on other parts of the aquarium.
Kit contains 2 bottles of liquid reagent, 2 glass test tubes with snap-tight caps, step by step instructions and information on how to correct unsafe conditions.
- Monitors GH & KH to create a more natural habitat
- Use in Fresh Water
API Makes it Simpler
Regular Care: Regular testing of key water parameters is an essential part of routine aquarium maintenance. Levels should be tested weekly to make sure they do not reach undesirable levels, as well as when a problem appears. “Taking just a few minutes on a regular basis to maintain your aquarium conditions is the key to a healthy aquarium.
Water Problem Solving: When problems develop in an aquarium, it's important to identify the problem and solve it quickly
Promotes a vibrant, planted aquarium
Easily to use liquid carbon
Can be used alone or with CO2 systems
API FRESHWATER MASTER TEST KIT
Tests pH, High Range pH, Ammonia, Nitrite & Nitrate
Includes all tests required to test the nitrogen cycle
Fast, easy and accurate
pH UP/ pH DOWN
Raises / Lowers aquarium pH
Makes water more alkaline / more acidic
Top Customer Reviews
*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
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.
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.
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.
Most Recent Customer Reviews
a test tube came broken. i didn't want to return the whole thing for just one tube but just know they are really fragilePublished 5 days ago by Amazon Customer
Product as described, although it arrived squished due to inadequate packaging.Published 12 days ago by Amazon Customer
Works as shown - but go to API website and READ DANGER LABELS. It is worth researching the dangers of this product BEFORE you purchase.Published 16 days ago by JAZR
kinda of confusing on how to get an accurate reading and how to interpenetrate what the readings mean.Published 20 days ago by Nicholas C.
Tests the appropriate parameters. Really easy instructions and testing.Published 24 days ago by David zheng