NASA Talent - Crystalline product development is lead by a former NASA Engineer. Brain-power with a history in space... Making life better at home! Watch our "What About Particle Size" video for detailed information! Ultimate Compatibility - Manufactured to strict tolerances ensuring 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 performed by SGS on PureIllusion Crystalline Filtration material, 15 July 2022 (See Product guides and documents, Certificate of Analysis) Meet the Crystalline Stage 1 Ultra Premium Pre-Filter... A boutique IQ Air Filter Replacement designed and manufactured by PureIllusion. Crystalline Stage 1 is a tailor-made alternative for the IQAir PreMax Filter in your IQAir Health Pro Plus air purifier. PureIllusion never compromises when it comes to fresh clean crisp-smelling air. When installed in your filtration system you will notice a Crystalline Stage 1 filter has the same precise fit as an original equipment IQAir 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). Upgrade the filters found in your IQ Air Purifier to PureIllusion Crystalline today for Ultra Premium Air!!!