Apparatus for filtering drinking water; Automatic flush valves for toilets; Composting toilets; Filtering units for water filtering, producing potable water for domestic use; Filters for drinking water; Plumbing fixtures, namely, shower sprayers; Portable toilets; Toilet accessories, namely, handles that are affixed to toilet seats; Toilet seat adaptors for children in the nature of a plastic device that is specially adapted to rest on a toilet seat; Toilet tanks; Toilets; Toilets, portable; Water closets; Water conservation plumbing fixtures, namely, faucets, aerators, showerheads, water saving toilets; Water filtering apparatus; Water filtering units for aquariums; Water filtering units for domestic use; Water filters; Water filtration and purification units and replacement cartridges and filters therefor