NASA Talent: Product development is led by a former NASA Engineer; Brainpower with a history in space, making life better at home Ultimate HEPA Filtration: Includes Genuine Crystalline Ultra Premium Stage 3 True HEPA Filter; easy-to-follow illustrated installation instructions; thank you card and complimentary product support No Compromises: Crystalline Filtration Technology captures ultra-fine particles, including .003 micron, with unrestricted airflow in compatible Health Pro series air purifiers Scientific Validation: Using TSI-8130 according to EN1822-3 standards to ensure proper performance; Watch our "What About Particle Size?" video for detailed information Ultimate Compatibility: Manufactured to strict tolerances; Crystalline Stages F1, F2, and F3 are compatible with IQAir PreMax Filter F8, IQAir V5 Filter, and IQ Air Hepa Filter respectively Independent Testing: SGS performed independent testing on PureIllusion Crystalline HEPA Filter on September 15, 2025 (Download Document in Section Below - Safety and product resources, Saftey Documents, Certificate of Analysis) Independent Testing: SGS performed independent testing on PureIllusion Crystalline HEPA Filter in combination with PureIllusion Crystalline Prefilter on September 15, 2025 (Download Document by visiting PureIllusion Scientifically Tested Filter Bundle Listing - Safety and product resources, Saftey Documents, Certificate of Analysis) Meet the Crystalline Stage 3 Ultra Premium HEPA Filter... A scientifically tested boutique filter replacement designed and manufactured by PureIllusion. Crystalline Stage 3 is a tailor-made compatible direct-fit iq air filter replacement designed for the iqair healthpro plus air purifier systems, which includes the HealthPro, HealthPro Compact and Health Pro Plus air purifier systems. PureIllusion never compromises when it comes to fresh clean crisp-smelling air. We have gone to great lengths to manufacture a direct-fit filtration line for the Health Pro. When installed in your filtration system you will notice a Crystalline Stage 3 filter has the same precise fit as the original equipment filter. To ensure high quality filtration PureIllusion tapped a former NASA Engineer to lead Crystalline product development. The product line has been scientifically tested to ensure proper filtration (see product images and data below). Crystalline Stage 3 pleated HEPA material is an H13 Synthetic Melt Blown Fabric. It undergoes scheduled quality control according to EN1822-3 standards using a TSI-8130. Pass Requirements include an efficiency >= 99.97% .3 micron with a resistance >= 30 Pa and a weight of 90gsm within +- deltas. A Crystalline HEPA filter removes ultra fine particles to produce truly purified air. Upgrade your filters to PureIllusion Crystalline today for Ultra Premium Filtration!!!