Water filters

Hi, I have two cylinder type water filters under my sink with a tap on the sink. I presume these are to have clean drinking water. The water coming out has black deposits in it so I presume I need to replace the filters. Would anyone know where I can go and buy these please? Many thanks

DIY on the right before you get to Los Montesinos has loads of different types.
I've also found the DIY shop by Consum very good with stock.
Unless you have a specific brand then you may have to go the suppliers but we got ours at Los Montesinos (there's a type number printed on the cap).

Thank you, I will go and get them