NASA Talent: Product development is led by a former NASA engineer; Brainpower with a history in space, making life better here at home Ultimate Pre Filtration: Includes Genuine Crystalline Ultra Premium Stage 1 Pre-Filter; easy-to-follow illustrated installation instructions; thank you card and complimentary product support No Compromises: Crystalline Trade Secret Pre Filtration Technology provides >= 90% .3 micron capture, as opposed to >= 55%; increased performance without restricting purifier airflow (CFM) 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 Module, IQAir V5 Cell Module, and IQ Air Hyper Hepa Module respectively Independent Testing: SGS performed independent testing on PureIllusion Crystalline Prefilter 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 Prefilter in combination with PureIllusion Crystalline HEPA Filter 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 1 Ultra Premium Pre Filter... A scientifically tested boutique filter replacement designed and manufactured by PureIllusion. Crystalline Stage 1 is a tailor-made compatible direct-fit iq air filter replacement designed for the PreMax Module of iqair healthpro plus air purifier systems, which include the HealthPro, HealthPro Plus, and HealthPro Compact air purification 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 Pre Max Module. When installed in your filtration system you will notice Crystalline Stage 1 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 1 utilizes a scientifically tested F8 synthetic pleated media qualified for pre-filtration. It undergoes scheduled quality control according to EN1822-3 standards using a TSI-8130. The media pass requirement includes an efficiency >= 90% .3 micron, with a resistance >= 13 Pa, and a weight of 22gsm within +- deltas. Regular prefilter replacement protects the internal components of your health pro plus air purifier while maximizing system performance. Upgrade your filters to PureIllusion Crystalline today for Ultra Premium Filtration!!!