I know this topic has come up before but can't find the link I want.

I am aquiring two more external cannister filters today - second hand - and want to make sure nothing comes into my breeding tanks when I set them up. Can the media be sterilised - not the sponges etc as I know how to do those but things like the bio balls etc and those little things that are white and sort of brick like looking (can't remember their names) or should I just get new. Normally I sterilise in bleach then rinse and put into sun.

Yep, boil them.

But if they are plastic, I wouldn't get the temp up that high in case it starts deformation.

I would just get new ones.

ron

Either bleach them or boil them, I'd say. Or boil them in bleach. Apparently bleach also helps to unclog them. So they should be good as new afterwards.

sodium metabisulphate. you can find it in your brewing section of your supermarket.

do the ceramic noodles cope with boiling - I've remembered their names now.

Yes, they'll be fine.