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Discussion Starter · #1 ·
I just filled my water for my emersed 4g tank 2 days ago. I did a water test and my KH is 180. As far as i am concerned that is way to high. How can i go about bringing it down? Using RO water?
 

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Discussion Starter · #3 ·
I havnt done a water change yet. I just added the water a few days ago.
 

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Discussion Starter · #7 ·
what do you have in your hardscape?
rocks, what kind? shells? substrate?
I have flourite sand, and i have some sort of pagoda stone i got at my LFS.

and ya i tested my tap water. Its a 120ppm for KH
 

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anyway look at the following which i scammed from here http://www.chelonia.org/Articles/waterchemistry.htm

I guess the possiabilities are you have very low co2 levels, the pagoda stone is bumping it up or the sand. how is you plant load? does the ph go up as the KH goes up?


Carbonate Hardness (KH)

This is an area where many people get confused. One of the reasons the term alkaline is avoided a bit and the term Basic is used for the pH scale is because this reading is measuring the alkalinity of the water. It is not the same as alkaline.



The alkalinity is a measurement of the waters buffering ability, or its ability to absorb and neutralise acid. Clearly the more alkalinity or the higher the Carbonate Hardness of the water the less likely you will incur pH swings in the water. It is therefore important to get this figure reasonably high to stabilise the water.



Exactly how high you want your dKH (degrees of KH) will depend on what pH you choose to use. To people keeping fish from the African Lakes this is the life and death of their fish. Those fish live in very stable high pH conditions, they do not like change and the conditions can be difficult to imitate. Fortunately turtles are not quite so sensitive. However, I do think that basic fish keeping can teach the aquatic turtle keeper a thing or two about water.


Ways to increase kH

Adding sodium bicarbonate (baking soda). One teaspoon of baking soda added to 50 liters of water can raise the kH of the water by approx 4 deg dH without a major affect on pH.
Adding an air stone to increase surface turbulence driving off carbon dioxide (CO2)
Adding commercially available products to increase buffering capacity


Ways to lower kH
Injecting carbon dioxide (CO2)
Use reverse osmosis (RO) water. You can mix tap water with reverse osmosis water to achieve the desired kH.
Adding commercially available products to decrease the buffering capacity.
 

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Discussion Starter · #9 ·
Wow thats some nice info. I have a pressurized CO2 set up on my tank. Its doing about 2 bubbles a second. My ph is about 6.7..
 

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Do you have any fish in this tank?

Using the KH-PH CO2 calculators your CO2 concentration would be 60.4ppm.

I used to have water with a KH of over 400ppm but the PH would climb to 8+ and I just had to learn to live with it. As long as the fish lived, I didn't attempt to change it (which I did at first and lost tooooo many fish due to PH change.)
 

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anyway i always recommend a drop checker, here is a nice one that is very small especially needed in a 4g [size wise]. Just be careful in that drop checkers take time to react to CO2 changes. With Pressurized CO2 you can change the CO2 levels faster than the drop checker can react due to the small volume of the water [4g] Just make CO2 changes slowly and over and extended period of time...

http://www.greenleafaquariums.com/co2-drop-checkers/cal-nano-checker.html

Why were you worried about 180? do you have something that requires soft water?
 

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Discussion Starter · #12 ·
no not really. I dont have any fish or anything in there. I plant to keep a small school of rasporas and some sort of shrimp (havnt made my mind up yet). I just thought that it was to high for a freshwater tank. I normally do saltwater, and thats a normal number for salt water, i just more assumed i guess that it was too high.
 

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Ways to increase kH

Adding sodium bicarbonate (baking soda). One teaspoon of baking soda added to 50 liters of water can raise the kH of the water by approx 4 deg dH without a major affect on pH.
Unless your pH is already at 8.4 (the pH of baking soda), this will probably raise your pH depending on the amount of acidic buffers in your water.

Ways to lower kH
Injecting carbon dioxide (CO2)
No, carbonic is such a weak acid that it doesn't have any appreciable effect on kH.
 

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Using the KH-PH CO2 calculators your CO2 concentration would be 60.4ppm.
Since those calculators don't work unless carbonates are the only buffer in the water it is doubtful that he has a CO2 concentration anywhere near 60ppm.

Agree with the suggestion to leave water chemistry as is. If you are determined to soften your water, though, the safe and reliable way to do it is to mix in RO water (or distilled) with your tap.
 
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