aquacrest f-201r filter cartridge, nsf/ansi 42 certified, replacement for f-201r filter cartridge (pack of 2) aqua crest <b>aquacrest: quality water quality life</b><br><br> aquacrest replacement f-201r filter cartridge is interchangeable with stainless steel tank and filtration system. replacement for f-201r water filtration cartridges.<br><br> <b>filter hot water? </b><br><br> not necessarily. water passes through the filter first before entering the instant hot water tank for heating. hot water will never enter the filter, which explains why working temperature of the filter is 33°f to 100°f. see the illustration for water flow path from the product image<br><br> <b>pure water for your entire family </b><br><br> offers pure water for multiple uses, giving enhanced protection to your family. helps to transfer true coffee or tea flavor to your taste buds and makes coffee or tea taste exactly like it was meant to<br><br> <b>normal tds value</b><br><br> tds stands for total dissolved solids, is composed of inorganic salts and a small amount of organic matter. our filter cannot obviously lower tds value because it uses coconut shell activated carbon that can filter harmful substances while keeping beneficial calcium, magnesium, which is the main component of inorganic salts.