Bio pearls are a palletised biodegradable polymers which promote good bacterial growths. These bacterias take up nitrates and phosphates then are removed via the protein skimmer . This product works best if used in conjunction with protein skimming.
If this is the first time you are using them please only add small amounts per week. If you add too much you will have bacterial blooms and your tank will become cloudy. For each 100L only add 25ml per week. The included spoon holds 10ml for easy measurements.