For potassium level, some brand contains higher level. Assuming the manufacturer keeps the level consistent all the time, this reference can be used:
http://www.tanktests.co.uk/index.php?target=pages&page_id=salt_water_study
Cheers
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Have about 200ml of bio pellet and it moves well.
Tried with a 300l/h pump but it doesn't move as much then clump up make the water very cloudy when I shake it ...
I turned off the skimmer. Brightwell biobacter recommended it.