1 liter of lava rock in the graining 7-17mm has a very large surface through its natural Porosität, provides through it for a very good biological pollutant dismantling. Through its form, the filter volume optimally is exploited. It is to be cleaned easily and very long applicable. Suitable for sweet water and sea water.
Vorgereinigt, should be cleaned however before use once again with clear water, rubbed is caused because by that in the carrier dust.
1 liter corresponds ca 1.3 kg.
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