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The miracle weapon against algae in the garden pond + 1 NH Toxex ball (removes contaminants from the pond). The natural ToxEX Ball binds pollutants such as nitrite, nitrate and phosphate out of the pond water. Natural Organic filter in the garden pond. A pond mussel filters 400 l pond water per day. Size: 5-9 cm. It is a peaceful pond inhabitant. Winter hardy. Pond mussels can be over-wintered in the garden pond without any problems.; Product description Ideal for keeping in garden ponds, the mussel is there as a natural filter system - it clarifies the green water and takes care of suspended particles. The miracle weapon against algae green pond water. One mussel in a pond filters 400L of pond water per day. TOXEXBALLS: The natural Toxex balls perform their function depending on the concentration of harmful substances for 4-7 months, then should be exchanged or taken out of your pond. They are best used in the filter. If this is not possible, they can also be placed in the filter, but this is not as effective as putting them directly in the pond.; Product description Ideal for keeping in garden ponds, the mussel is there as a natural filter system - it clarifies the green water and takes care of suspended particles. The miracle weapon against algae green pond water. One mussel in a pond filters 400L of pond water per day. TOXEXBALLS: The natural Toxex balls perform their function depending on the concentration of harmful substances for 4-7 months, then should be exchanged or taken out of your pond. They are best used in the filter. If this is not possible, they can also be placed in the filter, but this is not as effective as putting them directly in the pond.; Ideal for keeping in garden ponds, the mussel is there as a natural filter system - it clarifies the green water and takes care of suspended particles. The miracle weapon against algae green pond water. One mussel in a pond filters 400L of pond water per day. TOXEXBALLS: The natural Toxex balls perform their function depending on the concentration of harmful substances for 4-7 months, then should be exchanged or taken out of your pond. They are best used in the filter. If this is not possible, they can also be placed in the filter, but this is not as effective as putting them directly in the pond.