chemi pure

[Invigor]

Originally Posted by muck

I think your thinking of Chemi-Clean Greg.
Chemi-Pure you "don't have to change" for 6 months.

mine give out at about 3 weeks :|

[Bob I]

Originally Posted by Invigor

mine give out at about 3 weeks :|

From the container again. "Replacement varies depending on type of aquarium Chemi Pure is used in; 1 - 6 months"

I would like to know how you determine yours is used up in three weeks.