What do you consider soft or hard? - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 04-12-2005, 12:52 AM Thread Starter
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What do you consider soft or hard?

I have noticed a great variation in "hardness charts" in the interpretation of water hardness in dGH. Mainly in different test kit instructions and on different pages and forums on the net.

Some say 6 dGH is hard. Some say that's medium hard. Some say that's soft.

What do you think?

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post #2 of 6 (permalink) Old 04-12-2005, 01:37 AM
 
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I too have seen different charts but hears what I "think"
0-4very soft to soft
4-9 med to med hard
10-16 hard
18+ very hard
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post #3 of 6 (permalink) Old 04-12-2005, 08:05 AM
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Those ranges seem to correlate to what I see often.

This is the problem with using general terms.... "hard", and "soft". It gets confusing as there is no determined value, which is why it's always better to refer to your GH value (in dGH or ppm), rather than "hardness".


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post #4 of 6 (permalink) Old 02-17-2006, 01:44 PM
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Quote:
Originally Posted by Hypancistrus
I have noticed a great variation in "hardness charts" in the interpretation of water hardness in dGH. Mainly in different test kit instructions and on different pages and forums on the net.

Some say 6 dGH is hard. Some say that's medium hard. Some say that's soft.

What do you think?
I know this thread is really old.. but I wanted to contribute for posterity.. The widely accepted definitions of hardness are found at the Krib website.

http://faq.thekrib.com/begin-chem.html

0 - 4 dH, 0 - 70 ppm : very soft
4 - 8 dH, 70 - 140 ppm : soft
8 - 12 dH, 140 - 210 ppm : medium hard
12 - 18 dH, 210 - 320 ppm : fairly hard
18 - 30 dH, 320 - 530 ppm : hard
higher : liquid rock (Lake Malawi and Los Angeles, CA)

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Barry
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post #5 of 6 (permalink) Old 02-18-2006, 01:35 AM
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Any water is hard compared to what I normally get out of the tap.
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post #6 of 6 (permalink) Old 02-25-2006, 02:05 AM
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Quote:
Originally Posted by Rex Grigg
Any water is hard compared to what I normally get out of the tap.
You lucky SOB

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Robert

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