The Multi-Pure CBTAs carbon block arsenic removing 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 attachment). CBTAs water filters are NSF Certified under NSF/ANSI Standard 53. Click image to enlarge. Shipping This item cannot ship for free. Please place your order and we'll be in touch within one business day with a shipping quote for your approval. Contact us: (512) 789-4652. Availability: Usually ships the next business day Multi-Pure CBTAs Replacement Filter CBTAs$116.95 Multi-Pure CB-AsSC (Removes Arsenic) removes arsenic, 600 gal. per filter $499.00 Multi-Pure CB-AsSB (Removes Arsenic) removes arsenic, undercounter 600 gal. per filter $519.00 MultiPure CB-AsSB-PID (Removes Arsenic) - with filter monitor removes arsenic, undercounter 960 gal. per filter $609.00 Multi-Pure CB-AsSI (Removes Arsenic) removes arsenic, in-line 600 gal. per filter $469.00 Replacement Filters - Water