Abstract: A filter assembly is provided for collecting samples in a fluid environment, the assembly utilizing a laminar convective flow to cause the flow of a preservative/fixative and a filtrate through a filter. A substantially concave dead space around the filter is flushed free of the preservative and the differential in density of the preservative and filtrate causes the more dense fluid to collect in the reservoir and preserve the collected specimen.

Abstract: A filter assembly is provided for collecting samples in a fluid environment, the assembly utilizing a laminar convective flow to cause the flow of a preservative/fixative and a filtrate through a filter. A substantially concave dead space around the filter is flushed free of the preservative and the differential in density of the preservative and filtrate causes the more dense fluid to collect in the reservoir and preserve the collected specimen.

Abstract: A filter assembly is provided for collecting samples in a fluid environment, the assembly utilizing a laminar convective flow to cause the flow of a preservative/fixative and a filtrate through a filter. A substantially concave dead space around the filter is flushed free of the preservative and the differential in density of the preservative and filtrate causes the more dense fluid to collect in the reservoir and preserve the collected specimen.

Abstract: An automated water sampling system collects multiple samples of sample water at a remote site. A multiport valve provides a plurality of ports and respective port inlets. A sample water intake line is coupled to the respective port inlets. A plurality of sample receivers or sample containers are coupled to respective ports of the multiport valve. At least one container of cleaning liquid is also coupled to a port of the multiport valve. An output manifold provides a plurality of manifold outlets coupled to the respective sampler receivers and to at least one container of cleaning liquid. A pumping water output line is coupled to the plurality of manifold outlets. A reversible pump is coupled in the water output line for pumping and drawing sample water through the intake line into selected sample receivers and for pumping and pushing cleaning liquid from said at least one cleaning liquid container out the sample water intake line. The multiport valve opens and closes the ports one at a time.

Abstract: A multiport valve for a water transfer system passes water, drawn by a pump, through a plurality of collectors. A programmable controller controls operation of the pump and a stepper motor which positions the multiport valve in a time series sequence according to user instructions. The multiport valve is formed with a first valve head having an intake port and multiple separate outlet ports. The respective outlet ports are connected to the respective collectors at respective collector inlets. A first rotor bears against the first valve head and forms a seal between the first rotor and first valve head. The first rotor is formed with a first coupling channel for coupling the intake port of the first valve head to different outlet ports according to the rotational position of the first rotor. The multiport valve incorporates a second valve head formed with an exhaust port and a plurality of separate inlet ports coupled to the respective plurality of collectors at respective collector outlets.