IPAK Gard(R) 10-15 pretreatment pack H provides optimal protection of the reverse osmosis (RO) membrane for hard water, improving your system's performance and extending its lifetime. For use with Milli-Q(R) IQ 7010, Milli-Q(R) IQ 7015, Milli-Q(R) IX 7010 and Milli-Q(R) IX 7015 water purification...