Help!! Water Hardness Confusion
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07-08-2012, 05:31 PM   #1
FenderOffset238
Algae Grower

Join Date: Apr 2011
Location: New Jersey
Posts: 130

# Help!! Water Hardness Confusion

So I have started up a new planted tank using RO water, and I know you must add back trace elements/buffers to the water.... but I have no clue what im measuring when it come to water hardness.

Im looking to set the parameters of the tank around: gH 3-5 with kH 2
But the test I have measures the GH in "mg/l CACO3" and KH in mg/l
How do I convert this to get a regular GH or KH reading?

My water is yet far (from the test):
GH - 60 mg/l
KH - 20 mg/l

Can anyone shine light on this chemistry confusion... I just cant seem to comprehend what means what, and I've done my share of reading too....

 07-08-2012, 06:04 PM #2 deleted_user_17 Planted Member   PTrader: (0/0%) Join Date: Jun 2012 Location: Usa Posts: 260 Hiya I am new to RO water too and having to get my head around this stuff too. mg/l is equal to ppm So your GH - 60 mg/l can also be read as 60 ppm KH - 20 mg/l can also be read as 20 ppm To get the degrees of hardness dH, you divide by 17.9. So this means that GH - 60 mg/l can also be read as 60 ppm which when divided by 17.9 = 3.35 dH KH - 20 mg/l can also be read as 20 ppm which when divided by 17.9 = 1.12 dH This is how I understand things, hopefully this can be confirmed by someone much more experienced than me... __________________ My 7G Cherry Shrimp Nano Cube
07-08-2012, 06:17 PM   #3
FenderOffset238
Algae Grower

Join Date: Apr 2011
Location: New Jersey
Posts: 130

Quote:
 Originally Posted by Jedi_Pizza Hiya I am new to RO water too and having to get my head around this stuff too. mg/l is equal to ppm So your GH - 60 mg/l can also be read as 60 ppm KH - 20 mg/l can also be read as 20 ppm To get the degrees of hardness dH, you divide by 17.9. So this means that GH - 60 mg/l can also be read as 60 ppm which when divided by 17.9 = 3.35 dH KH - 20 mg/l can also be read as 20 ppm which when divided by 17.9 = 1.12 dH This is how I understand things, hopefully this can be confirmed by someone much more experienced than me...
Wow! I hope your right, cuz then i'm just about on track!

With a KH as low as this, is there any good way to handle the pH if you want to inject CO2? When I put in my diffuser around 1.5 bpm, my pH sinks.... but if worst comes to worst I can do with out the CO2...

 07-08-2012, 06:24 PM #4 deleted_user_17 Planted Member   PTrader: (0/0%) Join Date: Jun 2012 Location: Usa Posts: 260 I am keeping a shrimp tank and my tap water has nitrite in it so that's why I am going RO - so I haven't got a clue about CO2 injection! Wait for confirmation on my input, it could be very wrong! Good luck your tank __________________ My 7G Cherry Shrimp Nano Cube
 07-08-2012, 11:37 PM #5 FenderOffset238 Algae Grower     PTrader: (2/100%) Join Date: Apr 2011 Location: New Jersey Posts: 130 Jedi_Pizza - In the research I've done since, the info you supplied me seems to be correct. Just incase you were doubting yourself.
07-09-2012, 12:08 AM   #6
dmagerl
Planted Member

Join Date: Feb 2010
Location: Woodstock, IL
Posts: 240

Quote:
 Originally Posted by FenderOffset238 With a KH as low as this, is there any good way to handle the pH if you want to inject CO2? When I put in my diffuser around 1.5 bpm, my pH sinks.... but if worst comes to worst I can do with out the CO2...
I dont understand what you're getting at. Regardless of the KH, pH will always drop the same amount for the same amount of CO2.

A 1 point pH drop always indicates a 10 times increase in CO2 regardless of the KH value if all other variables remain constant.

Unless you're just saying a low KH equates to a low pH and CO2 will lower it more.

07-09-2012, 10:00 AM   #7
deleted_user_17
Planted Member

Join Date: Jun 2012
Location: Usa
Posts: 260

Quote:
 Originally Posted by FenderOffset238 Jedi_Pizza - In the research I've done since, the info you supplied me seems to be correct. Just incase you were doubting yourself.
Nice one
__________________

 07-11-2012, 06:19 AM #8 Diana Planted Tank Guru   PTrader: (0/0%) Join Date: Jan 2010 Location: Contra Costa CA Posts: 5,937 Get the KH up just a bit, and the pH will probably be more stable, though it will still show a drop. Get it closer to the 2 degrees (35 ppm) that you were aiming for.

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