Minimum allowable value of water efficiency and water efficiency grades for water purifier
1 Scope
This document specifies the minimum allowable value of water efficiency, water efficiency grades, technical requirements and test methods for water purifier.
This document is applicable to small water purifiers for domestic or similar use which use municipal tap water or other centralized water supply as feed water and reverse osmosis membrane or nanofiltration membrane as the main purification element.
This document is not applicable to any large water purifier with a length or width or height of ≥ 2,000mm, a mass of ≥ 100 kg and a water flow of ≥ 3 L/min.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 5749 Standards for drinking water quality
GB/T 5750 (all parts) Standard examination method for drinking water
GB 8538 National food safety standard - Methods for examination of drinking natural mineral water
GB/T19249 Reverse osmosis water treatment equipment
GB/T30307 Household and similar drinking water treatment equipment
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 5749, GB/T 19249 and GB/T 30307 and the following apply.
3.1
water purifier
system consisting of one or more filter elements for drinking water treatment that can improve water quality
3.2
reverse osmosis water purifier
water purifier for improving water quality and for domestic or similar use, which uses municipal tap water or other centralized water supply as feed water and reverse osmosis membrane filter as the core treatment element
3.3
nanofiltration water purifier
water purifier for improving water quality and for domestic or similar use, which uses municipal tap water or other centralized water supply as feed water and nanofiltration membrane filter element as the core treatment element
3.4
purified water flow rate
quantity of water produced per unit time under specified test conditions
Note: the unit is L/min.
3.5
purified water production rate
ratio of the total purified water from a water purifier to the total inflow water after the feed water is purified under the specified test conditions
3.6
concentrate
water that has been concentrated due to increased salt content after treatment by a purifier
Note: the unit is L.
3.7
minimum allowable value of water efficiency for water purifier
minimum allowable purified water production rate and rated total water purification capacity of a water purifier under the specified test conditions
4 Water efficiency grades for water purifier
The water efficiency grades for water purifier are classified into 3 grades, with Grade 1 as the highest. The purified water production rates and nominal rated total water purification capacities of water purifiers of each grades shall meet the requirements of Table 1.
Table 1 Indicator for water efficiency grades for water purifier
Foreword II
1 Scope
2 Normative references
3 Terms and definitions
4 Water efficiency grades for water purifier
5 Technical requirements
6 Test methods
Annex A (Normative) Preparation method for test water
Annex B (Normative) Test device for purified water production rate
净水机水效限定值及水效等级
1 范 围
本文件规定了净水机的水效限定值及等级、技术要求和试验方法。
本文件适用于以市政自来水或其他集中式供水为原水，以反渗透膜或纳滤膜作为主要净化元件，供家庭或类似场所使用的小型净水机。
本文件不适用于长度或宽度或高度≥２００ｍｍ、质量≥１０ ｋｇ，且净水流量≥３Ｌ／ｍｉｎ的大型净水机。
2 规范性引用文件
下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件；不注日期的引用文件，其最新版本（包括所有的修改单）适用于本文件。
GB 5749 生活饮用水卫生标准
GB/T 5750 (所有部分) 生活饮用水标准检验方法
GB 8538 食品安全国家标准饮用天然矿泉水检验方法
GB/T19249 反渗透水处理设备
GB/T30307 家用和类似用途饮用水处理装置
3 术语和定义
GB 5749、GB/T 19249和GB/T 30307界定的以及下列术语和定义适用于本文件。.
3.1
净水机water purifier
由一个或若干个饮用水处理滤芯组成的能改善水质的系统。
3.2
反渗透净水机reverse osmosis water purifier
以市政自来水或其他集中式供水为原水,以反渗透膜滤芯为核心处理元件,用于改善水质、供家庭或类似场所使用的净水机。
3.3
纳滤净水机 nanofiltration water purifier
以市政自来水或其他集中式供水为原水,以纳滤膜滤芯为核心处理元件,用于改善水质、供家庭或类似场所使用的净水机。
3.4
净水流量purified water flow rate
在规定的试验条件下,单位时间内的产水量。
注:单位为升每分(L/min)。
3.5
净水产水率purified water production rate
在规定的试验条件下,原水经过净化后,净水机的总净水量占总进水量的比率。
3.6
浓水 concentrate
经过净水机处理后产生的含盐量增加而被浓缩的水。
注:单位为升(L)。
3.7
净水机水效限定值minimum allowable value of water efficiency for water purifier
在规定的试验条件下,净水机所允许的最小净水产水率和额定总净水量。
4 净水机水效等级
净水机水效等级分为3级,其中1级水效最高。各等级净水机的净水产水率和标称的额定总净水量应符合表1的规定。
表1净水机水效等级指标值
水效等级 1级 2级 .3级
净水产水率/% ≥65 ≥55 ≥45
额定总净水量/L ≥4 000 ≥3 000 ≥2 000
