When i eventually got all the dust off and threw away some of the product it went in the aquarium where even more of it floated to the surface got sucked into the filter and damaged the impeller

Unfortunately i had no idea how light it was so light in fact that a lot of it floats on the surface even after soaking for days and rinsing there was a whole load of granules still floating which then have to be picked out and thrown away not a great start all of this is before you can even think about putting it near your aquarium