Waterlife BacterLife P is a blend of 2 essential groups of bacteria that are cultivated specifically for ponds. One group of bacteria break down solid fish waste uneaten food and plant debris whilst the other actively feeds on ammonia reducing toxicity levels. For Pond use only. - Reduces ammonia levels in ponds. - Activates pond filters. - Digests organic sludge in ponds. 500ml bottle -treats 13500 litres / 3000 gallons. Also available in 250ml 1 Litre bottles.