Beta Plus Bottle Kit -2.2L Vertical, Acrylic Use vertical bottles in mildly corrosive water, marine water and water with large amounts of suspended solids or adhesive colloidal solids to collect plankton and floating sediments. The wide mouth collects a true water sample with no contamination from other water levels. During descent, the open mouth does not restrict water flow. This makes them particularly suitable for collecting plankton, floating sediments and for use where metallic ion avoidance is desirable. These popular and versatile bottles come in your choice of transparent acrylic or opaque PVC. PVC is more durable and less costly, but the acrylic allows you to view the bottle contents immediately. When running metal, organic, or any other chemical analyses, it is best to run a blank on the sampler prior to use.