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Marc, do they cost about the same as Vertex?

how do they now the pellets encourage the growth of beneficial bacteria, rather than non-beneficial?

Henry, I checked one site and the price was comparable to Vertex pellets. Just under $70 for a one-liter bag.

Jonathan, I don't know the answer to that. Maybe non-beneficial is outcompeted.

Have you notice any difference in these pellets vice the other.