API GH and KH Test Kit
- 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
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.
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Compare to similar items
This item API GH and KH Test Kit
API Freshwater Master Test Kit B000255NCI
API KH Carbonate Hardness Test Kit B003SNDDAU
API Phosphate Test Kit B0006JDWGY
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|Item Dimensions||1.62 x 2.75 x 5.12 in||3.5 x 9.12 x 4.62 in||2.38 x 1.5 x 5.12 in||1.63 x 2.75 x 5.13 in|
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
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.
The reason I believe this is a manufacturer quality control issue rather than possible tampering from the seller is, a similar situation presented itself when I ordered the API Freshwater Master Test Kit. The first test kit I received had a faulty drop tip on the low range ph bottle, which leaked while in transit. The drop tip was installed, but somehow had a 45 degree angle on it. This item was sent out by Amazon directly. The GH and KH test kit was sent out by a 3rd party seller. My next step is to contact API and make them aware of my specific experience. If this happened to me twice within 3 weeks, I imagine it is happening to many people.
Thankfully these items were ordered from Amazon so they were able to rectify both situations. I received another Master Test Kit to replace the one with the faulty low range ph test bottle. I received a refund for the GH and KH test kit.
I gave this item 2 stars because the GH test worked perfectly. 5 stars, minus 2.5 for only half the test kit working. Minus .5 stars for the poor quality control.
This works well and I'm glad to add it to my tool kit.
Hopefully just a bad lot and will be returning for another set.