Red Sea ReefCan 18 Top Off Reservoir

The ReefCan 18 & 40 can supply the ATO of a 200-litre or 500-litre tank with enough water for about a week. They can fit in the sump cabinet or behind the tank, can be refilled without having to remove the reservoir and disconnect its tubes & cables, and have a transparent plastic body with an embedded water scale that allows you to see how much RO water is left.