Dilute chemical carrying systems include multiple embodiments of pressurizable and gravity feed reservoirs, and are provided for support and carriage of a segregated accommodation space, in some cases separately provided and in others integrally provided, for metered introduction of a concentrate into such reservoir. The structures both provide storage for concentrated chemical containers, and metered measurement while eliminating waste, make up time and minimizing contact between workers and the chemicals or nutrients in their concentrated state. Metering may be preferably provided by a pump assembly, and operational blocking of the pump assembly may be provided in separate or integrated structures. A concentrate container system enables users to recycle sealed containers to even further eliminate the necessity to directly handle concentrate.