If you are at-risk or you just want to protect your family's health, you need some information before you make a decision about which option to choose. Here we compare the four options, to help you make an informed decision. The threat, in this case, is cyst contamination. Cryptosporidium and giardia cysts may be present in tap water. If ingested, they grow inside the intestinal tract and cause illness. But, those with weakened or poorly function immune systems can die from the infection. Cysts threaten an individual's present health and reverse osmosis systems residential designs will remove that threat. THM exposure threatens their future health and residential reverse osmosis systems will not remove that threat. THMs are known to cause cancer and they are present in any water supply disinfected with chlorine. Exposure can occur due to drinking, showering, brushing teeth and reverse osmosis systems even from a pot of unfiltered boiling water. So, that should cross the boiling option off the list. Pregnant women, in particular, should avoid exposure to THMs and chlorinated drinking water. Researchers have shown that chlorine and/or THM (they aren't sure which just yet) increases the risk of miscarriage, premature birth and birth defects. Lead contamination is another concern, particularly for pregnant women, infants and children. If you are interested in Membrane Water Treatment Systems, please check our website at https://www.qileegroup.com for details. Or contact us Tel: +86 021 5169 7580 Phone: +86 &+86 &+86 Email: qilee@qileegroup.com Contact person: Xia Miao Add: Room 412, Xianglu Building, No. 3009, Gudai Road, Minhang District, Shanghai, China