GHE Bio Filter Stars
The stars are the favourite habitat for Sub Culture, which will thrive in them. The Stars are a porous substrate.
Criss crossed by many minute canals, made to let oxygen, water and inert particles move freely.
This is so that the environment stays healthy and clean.
You need 7 stars to give Sub Culture the adequate habitat where to thrive.
They are self cleaning as dead particles in suspension are easily ejected out while the new born cells replace them naturally.
They need no special maintenance. You can rinse them occasionally. It is best to replace them by half every 6 months.
Their black colour prevents algae growth.