(under subclass 65.5) Apparatus including a specific cover for the drain opening to permit drainage under appropriate conditions and to prevent the drain from becoming plugged by the growing medium.
SEE OR SEARCH CLASS
4, Baths, Closets, Sinks, and Spittoons,
650+, for drain covers not specific to plant husbandry.
210, Liquid Purification or Separation, appropriate subclasses, for filters that will allow water to pass, but retain solids.
