I've read threads where people can't find cheap carbon.
The best place is a garden shop that has pond supplies. 2'nd best is a pet or specifically fish store with pond supplies. 3'rd will be any other pet store. Beyond that use non clumping kitty litter instead. It's not nearly as effective but still works.
Carbon is cheaper than it appears. A gallon will run $20 - $30 on the auction site. That's 231 cubic inches. You don't completely fill the can, you only need a layer of 1/2" to 1". A gallon is enough for a 1/2" layer on a 36" long can with 4" sides.
It can also be reactivated. Rinse the carbon in warm filtered water. After it dries, soak it in cheap unscented rubbing alcohol until it evaporates completely.
Hope this helps.
The best place is a garden shop that has pond supplies. 2'nd best is a pet or specifically fish store with pond supplies. 3'rd will be any other pet store. Beyond that use non clumping kitty litter instead. It's not nearly as effective but still works.
Carbon is cheaper than it appears. A gallon will run $20 - $30 on the auction site. That's 231 cubic inches. You don't completely fill the can, you only need a layer of 1/2" to 1". A gallon is enough for a 1/2" layer on a 36" long can with 4" sides.
It can also be reactivated. Rinse the carbon in warm filtered water. After it dries, soak it in cheap unscented rubbing alcohol until it evaporates completely.
Hope this helps.