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I’m not good at maths, looking to add some Purigen to a 14g tank, the directions say 250ml treats 1000gallon, Not sure why it’s in ml as it’s not a liquid, I have the 250ml bottle, the contents weigh around 170g, with rock displacement etc my guess is a have 40litres, would about 17g of Purigen be about right for this size tank?


