问题48:投票的目的是包括配件和水龙头的具体结构完整性测试要求，并将高氯酸盐还原的进水挑战浓度从0.13 mg/L降低至0.10 mg/L，并将最大允许产品水浓度从0.004 mg/L提高至0.006 mg/L。

Issue 48: The purpose of the ballot is to include specific structural integrity test requirements for fittings and faucets and to reduce the influent challenge concentration for perchlorate reduction from 0.13 mg/L to 0.10 mg/L, and increase the maximum permissible product water concentration from 0.004 mg/L to 0.006 mg/L.