Traditional strainer, fits around the base of the suction tube.

Plastic strainer for suction tube.

Nylon bag that goes into the cup.

Plastic strainer for gravity spray-guns models type Sata etc.
275 micron.

Plastic strainer for suction spray-guns models type Iwata a.o. Suitable for spray-guns with a small suction tube.

Also very suitable for waterbased paints.