are rare as a natural contaminant but are generally the
result of agricultural and livestock run off and seepage
into ground water. Levels found range from <1 all the
way to 75 or 80 ppm (as ion). Both municipal and residential
treatments generally employ the use of strong
anion exchange resins with salt regeneration. Residential
treatment can usually be done using a single cubic foot
resin system with a choice of Type
I or Type II anion or selective anion depending on
the water analysis. It is not necessary to reduce the
nitrate levels to zero since the MCL as ion is 44.3 ppm
(ion). Treatment can be done on a split stream where only
a portion of the feed water is treated and blended back
in the 30 to 35 ppm range.
supplies Type I (Purolite
A400E) and Type II (Purolite
A300E) as well as nitrate selective (Purolite
A520E), all with NSF listings for safety. Check with
us for proper design since it is feed water dependent.
also supplies these resins in convenient 10 and 20 inch
Cartridges for under-counter and R/O polisher applications.