RoClean 403 is the premium product for systems operating on seawater, brackish water and waste water. RoClean L403 is certified by NSF International under NSF/ANSI Standard 60 for use as an off-line cleaner in drinking water systems. Please note: Antiscalants, cleaners and other chemicals can ONLY be shipped via ground service inside the continental US, Mexico and Canada due to shipping regulations.