And, after an initial cost of 60 bucks to buy the bacteria, which you'll never have to pay again, one cubic meter of bacterial sand would be about 11 dollars.
Depois de um custo inicial de 60 dólares  para comprar as bactérias, que nunca mais teremos de voltar a pagar, um metro cúbico de areia bacteriológica custaria cerca de 11 dólares.