A range of low maintenance end-use/point-of-use Balston filters are now available from Whatman. The filters remove 99.99 percent of oil, water, rust and pipescale particles of 0.1µm and larger from compressed air and other gases. The filters are designed to remove liquid contamination continuously for an unlimited time without loss of efficiency or flow capacity and can accommodate line sizes from 0.25 to 2 in. at flow capacities of up to 2,500 SCFM. They are constructed of anodized aluminum and stainless steel to ensure long-term reliability and performance. An automatic float drain and a differential pressure indicator are standard. Balston filters require minimal maintenance and most models can be serviced without tools.