Colombo Bacture Filter StartColombo Bacture Filter Start contains living nitrifying bacteria for starting new pond filters and restoring biological filtration after cleaning or winter shutdown. The formula contains more than 800 million living bacteria per millilitre.Key Benefits Helps establish biological filtration in new pond filters. Supports filters after cleaning or winter shutdown. Provides living nitrifying bacteria for pond-filter performance. Available in three sizes for different pond volumes. Core Features More than 800 million living bacteria per millilitre. Suitable for start-up, maintenance and raised ammonia or nitrite readings. Available in 500ml, 1L and 2.5L sizes. Technical Specifications Product type: Pond filter starter. Start-up dosage: 40ml per 1,000 litres daily for five days. Low-temperature use: Double the dosage below 10°C. Maintenance dosage: 20ml per 1,000 litres weekly. Who is this product for?Colombo Bacture is suitable for pond keepers starting a new biological filter, restarting filtration after winter or supporting a filter after cleaning.Follow the product label and monitor pond water values during use.