Hydor Sintered Quartz Bio-Rings For Biological Substrate Size:400 gm These treats were designed and

These treats were designed and recommended by veterinarians to make following your vet's instructions simple and stress-free

If you have a large powerful dog or one that pulls on the lead

Small grain size and rounded shape for less chance of impaction

moveable D-ring

Hydor Sintered Quartz Bio-Rings For Biological Substrate Size:400 gm These treats were designed andThe Hydor Sintered Quartz Bio Rings, 450 grams, are an ideal substrate for biological filtration. High surface area and the macroporous structure of the rings facilitates efficient growth of colonies of beneficial bacteria, both aerobic and anaerobic. Bio Rings do not release phosphates or heavy metals and do not effect pH of the aquarium. For freshwater or saltwater aquariums. PH neutral High Surface Area Easy to Use Ideal for optimal biological