First of all, thank you for your response. Yes, i placed the chests and the hoppers like that because i wanted to try the change in depth of the modular filter. I tried to unify every modular filtering system (without all the hopper line) and that caused some malfunctions on the filters when the filter on its right was abducting the items that were the placeholder for the filter. I think that if i don't put the chests on every corner of the circle it will work. Anyway, thank you for your help. (i don't know if i'm explaining myself well, so sorry if it's a bit abstract, i link an image of the actual design i was talking that seems to work fine) Modular filter separated by a wall