This Natural Water Butt Treatment 500ml is the perfect solution for keeping your water butts odour free and clean. The treatment includes a UV blocker which stops harmful rays that promote active algae growth and also gets rid of that grime within the water butt. This product also includes a flocculating agent which will clump together any debris which will then sink to the bottom. Made from beneficial bacteria, this product is completely harmless to all wildlife and the water is completely safe to use on plants! Product Specifications Safe to use on plants 500ml bottle Naturally cleans your rainwater harvesting system Directions For Use Add 10ml to 100 litres of rainwater. Apply once a week. 500ml treats 5000 litres. **Only suitable for waterbutts with lids or avaliable access to place inside.**