Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
Works but requires significantly more flushing than the OEM brand. Post initial flush and install the resulting water was discoloured. Had to flush approx two water tanks worth of my delonghi magnifica s through the system to clear loose debris.