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GH or KH?
#1
Whats the difference between Alkalinity and General Hardness? Got tests for both in my kit, and I'm a bit confused  Confused
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#2
Hello JD

General Hardness (GH) is a measurement of the sum of (mainly) dissolved calcium and magnesium.

Alkalinity is a measurement of water's ability to resist acidification. It's more or less directly related to the amount of dissolved carbonate and bicarbonate, and KH is a measurement of those.

Stephen and I are working on an expansion of his recent thread-opener on the subject of GH. His thread is called (something like) 'Hard water, soft water and fish'. It may be well worth a read pending the release of our update, maybe?
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#3
The carbonate/bicarbonate is effectively acting as a buffer 'mopping up' the extra H+ ions if you introcucded a strong acid into the water. Water with a low KH would change pH quickly and not go back to its original pH whereas water with high KH will stabilise the pH (up to a point), so if you have water with quite a high KH you will usually have a very stable pH (the measure of acidity/alkalinity).
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#4
I agree with the above.
As Vale! says we are working on an expansion on the thread below to explain GH and more.
Take a read of my post 'Hard Water, Soft Water and Fish'
https://www.aquariumforums.co.uk/showthr...p?tid=1494
6 foot (600L) South America Rio Guaporé theme.

7 x Biotodoma cupido, 4 x Laetacara dorsigera, 2 x Apistogramma trifasciata (wild), 20 x Gymnocorymbus ternetzi, 18 x Hyphessobrycon eques, 30 x Hyphessobrycon herbertaxelrodi, 18 x Corydoras Sterbai, 12 x Corydoras caudimaculatus, 9 x Otocinclus sp.

My Flickr page
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Thanks given by: jacksdad


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