u/Cold_Accountant_6327

It’s been draining really slowly past month or 2, took it apart the other day to clear out the debris but hardly anywhere, cleared it out anyway and put it back together but it’s not draining at all, could it be an airlock? How would I fix it?

Edit: water doesn’t seem to be passing the trap so how

From 80s I believe, all in boxes but some not in best condition as so old, no idea how to price these if it’s even worth. Can get close up if people need them,