A stopper assembly for a drain system of a fluid basin, components thereof and related methods are provided. The stopper head assembly includes a stopper head and a strainer to strain fluid passing through the drain system when the stopper head is in a drain position. The stopper head and the strainer may be selectively removable from the drain system as a strainer cartridge or unit by manipulating the stopper head relative to the drain system or a component installed in the drain system.