Review on ISpring FC25B High Capacity 🚰 Carbon Filter: Enhanced Filtration and Long-lasting Performance by Kelly Kunkel

Quality is poor because some white sticky/powdery material on the outside of the filter.There is no installation instructions & I understand that it can generic to be used with other 20 inch big blues too, but there has to be some instructions specific to iSpring 20 inch models & its missing. Like keep the rubber gasket on top & bottom while inserting the filter, how much to tighten the filter casing & how to handle the air pressure & any lubricant that needs to be applied on outside of the filter o-ring etc.