Lowering GH/KH - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 01-01-2003, 05:25 PM Thread Starter
PTrader: (9/100%)
Join Date: Jul 2002
Posts: 2,647
I was asked about lowering GH/KH in another section and decided to move into this section since this could be informative for everyone.

Ridns asked: I used water softener pillows to soften my water but only the GH went down. It had no effect on KH, Why?

A water softener contains ion exchange resins which selectively remove calcium,magnesium, and other metals such as iron and copper. It does this by exchanging sodium ions in the resin for those minerals much like a household water softener would. This method of softening water only affects GH and has no effect on KH.

There are several ways to lower KH in your tank.

One way is to use rain water or Reverse Osmosis water and use that to replace water removed during a water change thus diluting your tank water with softer water.

Another way is to add "peat" to your filter which wil lower both kh and GH but there are several drawbacks to using peat.
1) It adds tannins to the water which ,Depending on how much you use, will turn your water yellow-brown.
2) It adds humic acids to the water which lowers ph but throws off the KH/PH/CO2 relationship and those CO2 charts become pretty much useless to determine how much CO2 is in your tank. There are CO2 test kits which do measure CO2 directly and are not affected by this function.

If you want to learn more about peat and how it works CLICK HERE.
m.lemay is offline  


Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
lowering PH without Chems Blade General Planted Tank Discussion 3 08-11-2004 02:26 PM
Lowering Phosphate cruizer Fertilizers and Water Parameters 10 03-20-2004 03:42 AM
Lowering PH & Hardness with leaf mold. Slaigar Fertilizers and Water Parameters 7 01-24-2004 07:53 PM
Lowering PH without lowering KH cmontana Fertilizers and Water Parameters 12 01-21-2004 08:20 AM
Lowering Ph Peterstaud Fertilizers and Water Parameters 2 12-27-2003 01:32 AM

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
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome