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Discussion Starter · #1 ·
Hello I have a 250ml bottle of seachem purigen and was wondering how much of it I should use for a 30 litre tank? I have the chemi bag and stuff but im not sure because on the bottle it says 250ml treats 250gallons which means I should technically do 1ml of powder per 4 litres (this is hardly anything!).

Please help, thanks
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