This media provides an environment which helps growing colonies of good bacteria to consume ammonia and nitrite.
Use PLA or PETG only! Print with a layer heigth of 0.28 mm to have a coarse surface, without top and bottom layer and 15% gyroid infill. Print as many as you need but allow them to move around so don't put to many in the filter to let the water flow. Ideal for last meter of filament prints.
The author marked this model as their own original creation.