I was just thinking about filter media for HOB
filters and was wondering if large grain sand could be used in a fine mesh bag. I didn't know if it wold escape the filter though, but I was thinking it would work well for a replacement of carbon. I like the fine filtration of carbon in my ACs but don't typically run it. So I was thinking a bag of sand that the water could sift though might work well, just as long as the sand stayed in place and didn't squeeze through the bag.