Multi-Pure CBVOCSB undercounter drinking filter 750 gal. per filter $399.00 Multi-Pure CB-1100SB undercounter drinking filter 1,100 gal. per filter $428.95 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