To remove the standard screw in antisplasher (also known as Aerator or Perlator) from your Kitchen Tap :
Take an adjustable spanner. Cover your antisplasher with a cloth so that you don’t mark or damage it. Turn anticlockwise to loosen. If as sometimes happens with an old / broken Aerator (Antisplash) that part of it is stuck inside your spout, try this tip:
Try checking with a pin, and twist anticlockwise to remove
See here for the most common Antisplashers / Perlators / Aerators that we stock, which we have listed by thread type (male or female) and size.