Raising gh without raising ph - The Planted Tank Forum
 
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post #1 of 3 (permalink) Old 05-31-2020, 02:28 AM Thread Starter
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Raising gh without raising ph

My tap water recently jumped from ph7.4 to ph 8.8+. I found out that swordtails like harder water, so unlike my other two tanks I'm not lowering the ph as much. However, the tap kh is still low, 40ppm. I'd like to raise the gh+kh a bit, would adding a bit of crushed shell in the HOB filter help?

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post #2 of 3 (permalink) Old 05-31-2020, 03:28 AM
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Hi @butchblack,

Adding cuttlebone to the filter media will increase the calcium carbonate resulting in an increase of calcium (and dGH) along with the pH. Adding Seachem Equilibrium increases the dGH with minimal change to pH since it contains no carbonates. Hope this helps!

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post #3 of 3 (permalink) Old 05-31-2020, 09:02 AM
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Seachem Equilibrium doesn’t add to PH/KH directly on dissolution but let the carbonic acid in water work on those minerals for a few days and it will slowly feed your carbonate system. How much that will effect your PH depends on how much and how often you dose GH side. Add it all at once on water change and you’ll probably see a slight PH rise across 2-3days. Add it a little on water change day and then a little on top offs (1-2x wk) for evaporation throughout week and there will be very little PH shift.

Remember your GH test kit only reads Ca/Mg. Equilibrium is mostly potassium and that will never show on your GH test kit.

————————————-
Equilibrium
Guaranteed Analysis
Amounts per 1 g
Soluble Potash (K2O) 23.0%
Calcium (Ca) 8.06%
Magnesium (Mg) 2.41%
Iron (Fe) 0.11%
Manganese (Mn) 0.06%

Elemental potassium is present at a concentration of 195,000 ppm (19.5%). Fertilizer laws require us to list potassium in terms of equivalence to a material that is not present (K2O) rather than the more scientifically sound method of simple elemental equivalence.

Derived from: potassium sulfate, calcium sulfate, magnesium sulfate, ferric sulfate, manganese sulfate.
———————————

The potassium, calcium and Mg sulfate (Mg Sulfate=Epsom Salts) shown above are easy to buy as raw salts and build your own dosing solution cheaply. Add some potassium bicarbonate and sodium bicarbonate (baking soda) to your salts selection if you want, they’ll only show up on your KK/PH tests. If you dose some potassium bicarb lower your potassium sulfate dose, they are both adding K, just in different chemical compositions.
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