Dear Simona Cazacu

Why don’t you try blotting paper? Blotting paper, also known as bibulous paper, is a form of paper that is extremely absorbent. On the other hand, the filter paper has a specific porosity that allows it to filter out certain particles. But both, filter paper and blotting paper, are types of porous sheets.

Best.

Hello! Check if you can use Immobilon-P Blotting Filter Paper or Whatman gel blotting paper as subtitute, you might need to cut them to size

2 layers of filter paper per side of the sandwich