Table 2.

Summary of expected chemical concentrations in water treated with each product and corresponding international, United States and European Union drinking water guidelines

HWT product	Chemical constituent	Drinking water concentration* (mg/l)	WHO guideline (mg/l)	US EPA standard† (mg/l)	EU standard (mg/l)
SAFI	Copper	0.8	2	1.3	2
	Zinc	0.001	–	5	–
	Aluminum	0.001	–	(0.05–0.2)	0.2
	Iron	0.002	–	0.3	0.2
SCI–62®	Copper	1.03	2	1.3	2
	Zinc	0.002	–	5	–
	Aluminum	0.001	–	(0.05–0.2)	0.2
	Iron	0.002	–	0.3	0.2
SilverDYNE® ‡	Silver	0.07	0.1§	0.1	–
Antinfek™ 10H¶	PHMB	0.056	–	7**	–

^*Calculated from recommended dose and tested sample concentration (except PHMB, which is expected concentration).

^†Primary, but non-enforceable, maximum contaminant level goal (MCLG) for copper. Secondary, non-enforceable maximum contaminant level (MCL) for zinc, aluminum, iron and silver.

^‡Negligible amounts of copper, zinc and boron.

^§Non health-based guideline for average adult, based on 10 g/lifetime recommended limit.

^¶Negligible amounts of copper, silver, zinc and boron.

^**Adult average based on dietary recommendation of 0.2 mg per kg body mass per day, and 2 l/day drinking water.