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1, The biological ball were Fired by high temperature.
2, Great Material for the growth of nitrifying bacteria.
3, PH Neutral.
4, suitalbe for fresh water and sea water tank.
5, Do not often change these rings. After six month used, change half of them and use new rings with the rest old rings
1, After transportation, the bio rings may have ceramic dust on surface. Please understand it.
2, The new bio rings should be washed with frsh water before usage and then you had better put them in boiling water for 20 minutes.
3, After using the rings in fish tank , if the rings need to be washed , wash it with aquarium water , do not use tap or boiled water.