Premium Bio Ring (15mm) for freshwater or marine use

- High quality sintered glass rings for serious biological filtration
- 1L has estimated 1200L/m3 effective surface area for bacteria cultivation (5 times more than regular ceramic rings)
- Netural material (does not affect pH)
- Suitable for use in trickle filter, top filter, sump filtration, pond filtration, internal filter, canister filter
- Comes with filter net