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NSF/ANSI 58 System Type Clarification for Contaminant Reduction testing

NSF/ANSI 58 System Type Clarification for Contaminant Reduction testing. 2014. 5. 14. Sun Young Lee (COWAY). Issue. NSF/ANSI 58 groups ROs into 4 categories:

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NSF/ANSI 58 System Type Clarification for Contaminant Reduction testing

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  1. NSF/ANSI 58 System Type Clarification for Contaminant Reduction testing 2014. 5. 14 Sun Young Lee (COWAY)

  2. Issue • NSF/ANSI 58 groups ROs into 4 categories: • RO systems can fall under multiple categories and it is unclear which section has priority, which can lead to issues with consistency when testing an RO system. • 1. Systems with storage tanks and automatic shut-off. • 2. Counter top systems with storage tanks or reservoirs. • 3. Systems without storage tanks. • 4. Systems with no shut-off provisions

  3. Example Feed water + Post-filter ASO Pre-filter RO Drain Plumbed in countertop non-pressurized tank automatic shut-off • Type 1 • Systems with storage tanks • and automatic shut-off • Type 2 • Counter top systems with • storage tanks or reservoirs or

  4. Example • Main difference between type 1 and 2 • - Sampling requirements for day 1 • - Procedure for determining the DPR and efficiency for the RO • The characteristic permeate flux behavior • in type 1 & 2 system RO Permeate Type 1 Type 2

  5. Proposal • Type 1 should be used for systems with pressurized storage tanks and automatic shut-off. Regardless of whether they are under the sink, counter top, or other. • Type 2 should be used for systems with non-pressurized or open to atmosphere tanks or reservoirs and automatic shut-off. Regardless of whether they are under the sink, counter top, or other.

  6. Proposed Changes • Current: Systems with storage tank and automatic shut-off • Proposed: Systems with pressurized storage tank and automatic shut-off • Affected Sections: 6.9.7.1, 7.1.2.7.1, 7.1.3.5.1, 7.2.1.6.3, 7.2.2.6.3, 7.2.3.6.3

  7. Proposed Changes • Current: Counter top systems with storage tank or reservoir • Proposed: Systems with non-pressurized storage tank or reservoir and automatic shut-off • Affected Sections: 6.9.7.2, 7.1.2.7.2, 7.1.3.5., 7.2.1.6.1, 7.2.2.6.1, 7.2.3.6.1

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