Colombo Bacto Balls are impregnated with a unique mix of specially selected strains of beneficial bacteria. Only optimal bacteria strains are selected using specialised DNA screening techniques to achieve a complete biological balance in your pond. The active beneficial bacteria in Bacto Balls help remove harmful ammonia and nitrite from your water to create ideal conditions for your ponds inhabitants. They also help break down organic waste to aid the in the reduction of algae growth and increase water clarity. Colombo Bacto Balls Pond Bacteria is available in the following sizes:- Colombo Bacto Balls 500ml - Treats 5,000 Litres- Colombo Bacto Balls 1000ml - Treats 10,000 Litres- Colombo Bacto Balls 2500ml - Treats 25,000 Litres Instructions For Use:Always read the instructions fully prior to use. Dosage:Add 100 balls per 1000 litres of pond water - Replace monthly. Dose Colombo Bacto Balls directly into your pond or filter. For easy handling we would recommend placing Bacto Balls into a media bag which you can hang in your filter or pond. Overdosing with Bacto Bacteria Balls is not possible; a higher dosage will only enhance the products efficiency. UV-devices don’t have to be switched off during treatment.