Phosphate filter can be used on any Vertex PureWaterCooler.
Vertex – Optional Phosphate Filter for PureWaterCoolers
Pre-Filtration Phosphate filter is highly recommended for areas with hard water. Reduces scale build-up and keeps your water cooler running at peak performance. Filter measures 2" x 10" - NSF listed. Disposable Phosphate filter should be changed every 6 months.