With the Dennerle Dosator, aquarium plants are fertilized as they do in nature, because they receive a small amount of nutrients at all times. The advantages at a glance: - Permanent, even supply of nutrients, just like in nature - Even, balanced plant growth - Preventive against algae due to the lower nutrient content - Fertilization in the optimum range in the simplest way - Operationally safe, because no moving parts and no electricity (instead of a dosing pump) - Significantly cheaper than a dosing pump - Made of high-quality, durable plastic