Graf Carat tank 2700 litre, Complete System underground rainwater harvesting KIT. The tried and tested Carat from Graf, supplied complete as a kit for use as a garden rainwater harvesting system. The images above show some components of the Carat System. Excavation and electrical connections should only be attempted by qualified personnel. Graf Carat tank 2700 litre, Complete System underground KIT includes a 2700 litre underground tank, Optimax Pro filter, Series 3 pump and the accessories needed to deliver clean rainwater to a garden tap. Some standard external pipework and connectors will be needed but are not included in the kit as the location of the system will determine the amount of pipework required.
