Unscrew the nut that connects the drain to the flange using an adjustable wrench if you are replacing the pop-up drain. Then remove the drain flange from the T-connector.

If you can't unscrew the drain flange from the T-connector, use a reciprocating saw with a metal-cutting blade and cut the drain assembly away just above the T-connector.

When cleaning, unscrew the head bottom plug, drain fluid, remove the flange cover, remove the filter basket, cleaning and re load can, therefore, maintenance is extremely easy to use.