Astringent effect. Simply lay the leaves in the aquarium. The effect of the ingredients begins with no further action required and lasts 1 – 3 weeks. Harvested directly from the tree, cleaned and sun-dried. 1 leaf (approx. 24 cm long) to 50 – 100 l. Astringent effect = an agent that has a drying effect due to protein precipitation, an antihaemorrhagic effect and an anti-inflammatory effect upon contact with the skin or the mucous membrane. XL leaves with a length of approx. 24 cm. Contents: 10 leaves.