I do mean mechanical filtration. But it is specifically called Eheim mech and it comes with a new classic filter - it’s just the cylinders with the hole in them.
By course I mean the blue Eheim pad and by fine the white pad.
Seems to me adding more Eheim substrate pro would be more beneficial than the Eheim mech.
Eheim claims their mech ‘evenly distributed water flow’ with no real other purpose....wouldn’t the substrat break up flow anyhow?