In a floor drain assembly of the type including a floor drain having a collar surrounding a drainage opening installed in a recess in a floor, an improvement is provided. The improvement includes a skirt extending about the collar and secured to the collar by a fastener extending through the skirt and into the collar but not into the floor. The skirt defines an opening sized to receive a treatment material therein. A lid is configured for selectively engaging with the opening for allowing selective placement of treatment material in an area beneath the skirt.