Wednesday, May 18, 2011

Aquarium Water Hardness

The dH (degree of hardness) is simply the amount of dissolved mineral salts in the aquarium water. You can check the hardness of your tap water with a simple aquarium test kit. Bettas prefer soft water with a dH of less than 25. One way to dilute hardness is to add distilled water from the grocery store. Reverse osmosis units will also reduce hardness, but they are expensive and use a lot of tap water to produce a small amount of mineral-free water. Consider using one only if you need to soften a lot of water.

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