This listing is for 2 filters.Carbon Block CartridgeRemoves Chlorine, Taste & OdorRemoves Cryptosporidium & Giardia0.5 Micron FiltrationFits Standard 20" HousingsFloPlus cartridges utilize a revolutionary new technology that significantly enhances the traditional Fibredyne product, making it possible to obtain cyst reduction in a cartridge that functions like a nominal 10-micron cartridge.This product boasts extremely low pressure drops and high flow rates - comparable to 10-micron (very open) carbon cartridges. Its efficiency is so high that a 0.5-micron rating is possible, which means that cysts and very small particles can be removed to create cleaner, safer water.This product is ideal for applications where pressure drop and low flow have been chronic problems in the past, as well as whole house water treatment (using larger cartridges) with the addition of cyst reduction. However, it will address the needs of any end user looking for a product that offers high flow, low pressure drop, infrequent cartridge changes and cyst-free water.Features:Nominal 0.5-micron rating99.95% reduction of Cryptosporidium and Giardia cystsPremium dirt-holding capacityOutstanding chlorine taste & odor reductionTrue depth filtration which offers greatest life of any cyst-capable carbon cartridgePentek is the largest brand in the filtration industryPentek is the originator of carbon block production technologyPentek is the largest producer of carbon blocks worldwideBenefits:High flow rates and low pressure drop similar to a nominal 10-micron cartridgeMaximum life - dirt-holding ability of a 10-micron carbon block with the particulate efficiency of a 0.5-micron cartridgeApplications:Cyst reduction where low flow, high pressure drop or premature plugging has been problematicAreas where low water pressure has made cyst reduction difficult due to high pressure drops (low flow)ModelMaximum DimensionsNominal µm Rating*Initial ΔP @ Flow*Chlorine Capacity @ Flow*FloPlus-109-3/4" × 2-7/8"0.5 µm2.0 psid @ 1.0 GPM>10,000 gal @ 1.0 GPMFloPlus-2020" × 2-7/8"0.5 µm2.0 psid @ 2.0 GPM>20,000 gal @ 2.0 GPMFloPlus-10BB9-3/4" × 4-5/8"0.5 µm4.0 psid @ 2.0 GPM>25,000 gal @ 2.0 GPMFloPlus-20BB20" × 4-5/8"0.5 µm4.0 psid @ 4.0 GPM>50,000 gal @ 4.0 GPM* Based on manufacturer's internal testing.