From that
Tap water
samples used in the Nature Aquarium Gallery show that it is slightly alkaline and contains little nitrogen and phosphorus.
Amazonia
It contains more nitrogen and organic elements that any other Aqua Soils.
Amazonia is also rich in organic acid, such as fumic acid and acetic acid.
Amazonia II
The amount of nitrogen and organic acid contained is less than that of Amazonia.
Yet, Amazonia II lowers the pH level of water easier.
Africana
Africana has a strong ability to lower the pH of water and contains nitrate nitrogen.
Malaya
Because of organic acid in the soil, its ability to lower the pH level is the highest among the Aqua Soil series.
The data was taken 48 hours after adding the tap water to each soil.
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