Ships Free. The Multi-Pure CBTAs carbon block water filter is the only filter in the world certified to reduce Arsenic V. A specially developed absorbative media reduces particles down to 0.5 micron. Solid carbon block technology creates longer water contact time and greater adsorption of chemicals, pesticides, herbicides and certain heavy metals. Easy to replace, capacity is 600 gallons, or 960 gallons (with the PID attachement). Water filter life will vary in proportion to the amount of water used and the level of impurities in the water being processed. Click image to enlarge. CBTAs water filters are NSF Certified under NSF/ANSI Standard 53. Availability: Usually ships the next business day. Multi-Pure CBTAs Replacement Filter CBTAs$109.95 Multi-Pure CB-AsSC (Removes Arsenic) removes arsenic, 600 gal. per filter $419.95 Multi-Pure CB-AsSC-PID (Removes Arsenic) - with filter monitor removes arsenic, 960 gal. per filter $489.95 Multi-Pure CB-AsSB (Removes Arsenic) removes arsenic, undercounter 600 gal. per filter $440.00 MultiPure CB-AsSB-PID (Removes Arsenic) - with filter monitor removes arsenic, undercounter 960 gal. per filter $599.95 Multi-Pure CB-AsPI (Removes Arsenic) removes arsenic, in-line 600 gal. per filter $315.95 Multi-Pure CB-AsSI (Removes Arsenic) removes arsenic, in-line 600 gal. per filter $475.95 Replacement Filters - Water