High KH and very low GH...question about GH booster
Planted Tank Forums
Your Tanks Image Hosting *Tank Tracker * Plant Profiles Fish Profiles Planted Tank Guide Photo Gallery Articles

Go Back   The Planted Tank Forum > Specific Aspects of a Planted Tank > Fertilizers and Water Parameters


Reply
 
Thread Tools Display Modes
Old 11-22-2012, 09:29 AM   #1
CytoEric
Algae Grower
 
PTrader: (3/100%)
Join Date: Apr 2012
Location: Mississippi
Posts: 92
Default

High KH and very low GH...question about GH booster


Using the API tests to check my tap water, my KH is 10 and my GH is either 0 or 1 (changes color with the first drop). I bought some GH booster to raise my GH. I've read in a few places that you should match the KH and GH, but is it really necessary to get my GH up to 10? I'm not sure what the benefit of matching the KH and GH would be. I'm assuming that getting the GH to about 6 would be sufficient? Also, since 3/7 of the GH booster is potassium sulfate, would I still need to dose additional potassium as a fertilizer? Thanks.
CytoEric is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 11-22-2012, 10:32 AM   #2
wkndracer
Planted Tank Guru
 
wkndracer's Avatar
 
PTrader: (68/100%)
Join Date: Mar 2009
Location: Citrus County,Florida
Posts: 6,180
Default

3-5dGH is enough for good growth with most plants and values do not need to be matched in ratio GH/KH LOL.
__________________
The Fraternity of Dirt
If at first you don't succeed,,, keep kicking it
RubberSideDownOnTheLanding,
2-75g planted, 5-55g planted, 5-20g planted, 110g w/30g sump, 8-10g, Refugium, doghouse/newbie
2012 update adding table top pleco pans & a 90g (Nutz)
wkndracer is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 01:45 PM   #3
Bluek24a4
Planted Tank Enthusiast
 
PTrader: (5/100%)
Join Date: Mar 2010
Location: Queens, NY
Posts: 817
Default

Are you sure your gh test kit is working correctly?
Bluek24a4 is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 02:52 PM   #4
Rainer
Wannabe Guru
 
PTrader: (17/100%)
Join Date: Jan 2011
Location: TN
Posts: 1,611
Default

Isn't KH a component of GH and the therefore always a lower value?
__________________
29g high tech, 10g low tech halfmoon, and please see my 5g crescent journal.
Rainer is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 02:59 PM   #5
KH2PO4
Planted Member
 
PTrader: (0/0%)
Join Date: Jul 2009
Location: N/A
Posts: 283
Default

Quote:
Originally Posted by Rainer View Post
Isn't KH a component of GH and the therefore always a lower value?
Not necessarily. When you add baking soda (Sodium Bicarbonate),
Potassium Carbonate, or Potassium Bicarbonate, etc. You only
raise KH. In nature, the Calcium might be precipitated out somehow,
leaving more KH than GH.
KH2PO4 is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 03:04 PM   #6
Rainer
Wannabe Guru
 
PTrader: (17/100%)
Join Date: Jan 2011
Location: TN
Posts: 1,611
Default

Thanks for the clarification on this and the CEC question earlier.
__________________
29g high tech, 10g low tech halfmoon, and please see my 5g crescent journal.
Rainer is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 08:56 PM   #7
CytoEric
Algae Grower
 
PTrader: (3/100%)
Join Date: Apr 2012
Location: Mississippi
Posts: 92
Default

Quote:
Originally Posted by wkndracer View Post
3-5dGH is enough for good growth with most plants and values do not need to be matched in ratio GH/KH LOL.
I figured as much, but like I said, when I was researching I found a couple of sites that recommended matching them. They never gave a reason though, so I don't know why. Since the GH booster raises in 3's per tablespoon, I'll just aim for 6dH.

Quote:
Originally Posted by Bluek24a4 View Post
Are you sure your gh test kit is working correctly?
I believe it is. Back when I was using test strips they told me that I had a high alkalinity, but like no general hardness. I bought the API test kit and it gave me the same results. I've lived in places with both hard and soft water, and the water here definitely "felt" soft, so to be honest I was surprised the KH was as high as it was. I did test the KH against some 4dKH solution and it matched up. I haven't checked the GH bottle yet though...I think Hoppy has a way to calibrate it on here, I'll do that the next time I have some free time just to confirm, although I do think the results I have are at least close to true.

I have come across a few posts on the internet where someone was in the same situation as I am. It's definitely an unusual combination though. I've wondered how it comes to be...I'm assuming the water is naturally soft, but the water company is adding something to raise the KH.

Does anyone have any opinions on whether or not I'll need to dose additional potassium? It is a 40 gallon tank, and I do 50% water changes a week. So if I add 2 tablespoons of GH booster a week to get to a GH of 6, how much potassium am I adding? Would I need to add more? I know it is difficult to OD on K, but I don't want to add more than I'm taking out and end up with a dead tank in a couple months.
CytoEric is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 09:20 PM   #8
happi
Planted Tank Guru
 
happi's Avatar
 
PTrader: (20/100%)
Join Date: Dec 2009
Location: Salt Lake City, UT
Posts: 2,748
Send a message via Yahoo to happi
Default

gh and kh has nothing to do with each other, they both does not have to be equal either. for plants its always better to have low KH 5< if its higher than that some plants start to suffer, however they can tolerate higher GH.

you do not have to go crazy with gh booster, keep it around 3-4. you can aim potassium for around 25-30ppm, Ca around 25-30ppm and mg around 5-8ppm.
__________________
happi is offline   Reply With Quote Quick reply to this message
Old 11-22-2012, 11:55 PM   #9
Hmoobthor
Planted Tank Enthusiast
 
PTrader: (12/100%)
Join Date: Aug 2011
Location: WI
Posts: 764
Default

wow...must have very soft water...
__________________
Eheim Pimp Club #506
Hmoobthor is offline   Reply With Quote Quick reply to this message
Old 11-23-2012, 01:58 AM   #10
Diana
Planted Tank Guru
 
PTrader: (0/0%)
Join Date: Jan 2010
Location: Contra Costa CA
Posts: 6,401
Default

When I suggest that the GH and KH should be roughly equal, I am answering this question:
How to remineralize RO or Rain water.

In nature fish live in water where the GH and KH are roughly equal. This means there is a certain level of minerals (Ca and Mg, tested by GH) and a certain level of carbonates (tested by KH). The carbonates are a buffer that stabilizes the pH.

So, my goal in suggesting that the GH and KH be roughly equal in an aquarium is so the fish are in the water that most closely matches the lake or river they came from.

In this case, the tap water has high KH and low to no GH.
I would suggest using GH booster to raise the GH to whatever level suits the fish, and ignore the KH. Anything from about 3 degrees (soft water fish) on up (for harder water fish). Almost all aquarium plants are fine with a much wider range of conditions, so whatever suits the fish, go for it.

Yes, adding GH booster that includes K may mean that you will not have to add other sources of K in great amounts. Depends on how much GH booster you need to add to maintain the GH you want in the tank.
Diana is offline   Reply With Quote Quick reply to this message
Old 11-23-2012, 11:17 PM   #11
CytoEric
Algae Grower
 
PTrader: (3/100%)
Join Date: Apr 2012
Location: Mississippi
Posts: 92
Default

Thanks for the input everyone, and thank you for the explanation Diana. That does make sense regarding matching the water in the wild. The fish I'm keeping do like their water on the harder side, so I'll add enough GH booster to keep them happy.
CytoEric is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 03:38 AM.


Powered by vBulletin®
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright Planted Tank LLC 2012