This lovely family of water filter cartridges delivers premium quality drinking water for bottleless coolers and drinking fountains. Their unique filter blend uses activated carbon to reduce chlorine taste and odor and other offensive contaminants. Like most of Everpure’s carbon water filters, the OW family contains a precoat submicron technology which reduces dirt and particles as small as 1/2 micron in size. Check out my blog about Microns to see how small a 1/2 micron really is! But beware of the GIARDIA cyst!! The OW family inhibits scale from building up in your home water cooler, your water dispenser, or your drinking fountains. Keep an eye out for my up-coming blog about Scale!! Let’s break down this family and see what’s unique about each filter! The OW200L (P/N EV9619-06) has a rated capacity of 480 gallons. Its overall dimensions are 17″H x 3.25″ diameter. Its service flow rate is at maximum 0.5 gpm. This cartridge is commonLY used in office drinking water systems and home drinking water systems. In fact, that’s what I have installed under my sink at home. The OW2-PLUS (P/N EV9634-01) and the OW4-PLUS (P/N EV9635-01) are essentially the same. The only difference is their capacity rating and size. The OW2-PLUS is rated at 1,000 gallons and 10.25″H x 3.25″ Diameter. The OW4-PLUS is rated at 2,000 gallons and 14.5″H x 3.25″ diameter. But unlike the OW200L, they both contain a KDF media that can remove lead to below the Federal Action Level of 10 ppb. All the OW replacement water filter cartridges are NSF Certified under NSF/ANSI Standards 42 and 53, which means these cartridges get the job done! We gladly stock the OW family and for more information about the OW family, contact us at 1-800-942-7873 or click on the “Live Help ONLINE” link on the left of your screen.