I only actually change the filter when it's falling apart.
I don't run carbon all the time, so what I do is this: I run the carbon-filled filter pad for two weeks, then slit it open at the top, shake out all the carbon, give it a good swish in dechlorinated water, and pop it back in. When it gets gunked up, I swish it in dechlor'd water and pop it right back in. Whenever I feel the need to run some carbon, I put it in a mesh drawstring bag and drop it in the filter box.
Filter cartridges last practically forever like this. Aside from the carbon, which I feel is for occasional use anyway, they're for mechanical filtration and bacterial colonization, so why change them out all the time. I don't feel I'm being cheap, just practical.
__________________ Judy
Down to 3 tanks... from 7!!
29g: 3 goldfish (temporary)... thinking of convicts instead
55g: 12 glowlight tetras, 3 yoyo loaches (planning for another school of tetras, some more yoyo's, and maybe a pair of rams... any suggestions?)
2g: 3 guppies waiting for a bigger home and a few more buddies |