Table 1.

Characteristics of selected POU devices.

Treatment Technologies	No. of Individual Units Tested	Estimated Maximum Capacity	Certifications	Recommended Operating Limits
POU 1 (GAC + IX)	2	150 L (GAC/IX) and 1000 L (MF)	NSF/ANSI Standards 42 and 53	• Water temperature: 0 °C–29 °C (POU 1), 2 °C–30 °C (POU 2), 0 °C–60 °C (POU 3) • Recommended replacement interval: two months (GAC/IX), one year (MF)
POU 2 (GAC + IX + MEM)	2
POU 3 (MF + GAC + IX)	2