Remembering which filter to use has never been easier! Simply look for the Starburst Number on your filter and match it to the package number.Features KDF® and activatedcarbon. KDF is made of a high purity copper/zinc alloy that creates an electro-chemical oxidation-reduction that neutralizes harmful contaminates including bacteria. When combined with activated carbon it removes or greatly reduces chlorine, heavy metals like mercury, VOC, chemicals, sediment, lime/scale buildup and that hydrogen sulfide that causes a rotten egg smell. Without bacteria present in your water, you€™ll experience greater performance and longevity from your filter and some of the best tasting water you€™ve ever had!Virtually eliminate sediment with a one micron absolute filtration system. Reduces cysts such as cryptosporidium and giardia lamblia and chlorine by 99%. Rated for 10,000 gallons. Exact replacement for many OEM applications. Fits most 10" filter housings. Starburst #5. Priced each.