this is the advanced filter. advanced has NSF certified 42 & 53. only difference from premium is not NSF certified 401. good deal if you need one now.
2 pack advanced $17.59
https://www.amazon.com/gp/product/B07CGV6RZG
3 pack advanced $26.39
https://www.amazon.com/gp/product/B07CH5MK4Q