Here's the kind from the home improvement stores, similar to the one you list.
View attachment 1434417
The one above is ready to be changed out, the one below is the cartridge that was previously used and just as crudded up as the one above,
I soaked it in bleach, and let it dry.
View attachment 1434418
Where I live the cartridges like the one above are @ $7 each so I bleach and reuse until they fall apart (unravel)
the actual housing unit runs about $30+/-.
Interesting to see that the cartridge is just rolled string? i have thought about these kind of filter from home depot and lowes and so forth for inline home water filtration. I have actualy installed a 3 step system for my parents heavy metal well water but are chemical filters. I did not know there were simple ones like this with no chemicals added that would be safe for a fish tank. this realy is what i am looking for. Do these need to be in a pressurized line to work right. My idea is simply to be gravity fed from my overflow piped to this the over flowed into my sump. thanks for your time.




