I remember being told that the probable reason for the high silica capacity was that R&H used synthetic water with "unnatural" and monomeric silica. Therefore, this part of the curve was unreliable.For simple two beds, the fraction of silica to total anions seldom exceeds 50% and the “inaccurate” part of the curve doesn’t matter. The problem of rating anion resins with very high fractions of silica comes up mainly in multiple bed demineralizer designs with degasifiers, or lime softeners, and with weak base anion exchangers. In these cases the silica percentage of load on the strong base anion resin can approach 100% of total anions.