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Hydor Rings in Sintered Quartz BIO-RINGS for...
Macroporous structure sintered quartz rings for marine and freshwater aquariums, ideal as a biological substrate to promote the development of beneficial bacteria without altering the pH of the aquarium. They do not release harmful substances for the life of fish, phosphates or heavy metals.
Supplied in 450 g packs, they allow a great versatility of use inside the special compartments of the external and internal filters.