Shark Clean Sense HP100 and HC450 Series HEPA Replacement Filter HE1FKPRO

Hi Kat, Thank you for your feedback. We’re disappointed to hear about your experience, especially since your air purifier isn’t maintaining coverage as expected and your filter needs replacement sooner than you anticipated. We understand how frustrating this must be, and we appreciate you sharing this with us. To help maximize filter life and performance, we recommend keeping the unit in AUTO mode so once the air reaches 100% clean for 10 minutes, it shifts into ECO mode to optimize filter use. We also suggest flipping/rotating the HEPA filter every 3 months (reinserting it upside down) to balance captured particles and extend lifespan. The filter typically needs replacement every 6–12 months, and the Filter Life light will flash when it’s time. For further assistance and to make sure the unit is working as it should, please contact our Shark customer support team at 1‑855‑427‑5127, available Monday to Friday from 9 a.m. to 9 p.m. ET and Saturday from 9 a.m. to 6 p.m. ET, so we can take a closer look and explore the options available to you. Kind Regards, Shark Home