Aquarium Factors

Question
Dear sir,

I have a Fresh Water aquarium in my house and  after some tests to the Aqua Water i have made all factors were fine except the kh, the ph is fine. How can i increase the kh without affecting the ph?

Thank you

Answer
One teaspoon (about 6 grams) of sodium bicarbonate (NaHCO3) per 50 liters of water will increase KH by 4 degrees. Thanks. Good Luck.

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