Extended use zirconium silicate compositions and methods of use thereof

A cation exchange composition comprising a zirconium silicate of formula (I):

• ApMxZr1-xSinGeyOm (I)
• where
• A is a potassium ion, sodium ion, rubidium ion, cesium ion, calcium ion, magnesium ion, hydronium ion or mixtures thereof,
• M is at least one framework metal, wherein the framework metal is hafnium (4+), tin (4+), niobium (5+), titanium (4+), cerium (4+), germanium (4+), praseodymium (4+), terbium (4+) or mixtures thereof,
• “p” has a value from about 1 to about 20,
• “x” has a value from 0 to less than 1,
• “n” has a value from about 0 to about 12,
• “y” has a value from 0 to about 12,
• “m” has a value from about 3 to about 36 and 1≤n+y≤12,
• wherein the zirconium silicate is predominately ZS-9 and exhibits a lead content that ranges from ranges from 0.1 to below 0.6 ppm, and has a potassium loading capacity between 2.7 and 3.7 mEq/g.