A method is proposed for producing a biologically active, microorganism-containing aqueous solution or suspension comprising the following steps:i) provision of water；ii) the optional addition of a fine-grained mineral or organic material to the water and mixing of this materials into the water in order to obtain a suspension；iii) addition of compost to the suspension；iv) resting the suspension in an airtight environment for at least one week at a temperature of less than 15° C.This method allows the production of a biologically active, microorganism-containing solution or suspension, which can be added for example to improve the water quality of natural bodies of water in particular, but which is also suitable for enhancing soil and also for an external and internal application in humans and animals.
