I have attach the Characteristic of ADA Aqua Soil series from
ADA Aqua Journal From that
Tap watersamples used in the Nature Aquarium Gallery show that it is slightly alkaline and contains little nitrogen and phosphorus.
AmazoniaIt 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 IIThe amount of nitrogen and organic acid contained is less than that of Amazonia.
Yet, Amazonia II lowers the pH level of water easier.
AfricanaAfricana has a strong ability to lower the pH of water and contains nitrate nitrogen.
MalayaBecause 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.