Maybe a little more expensive than where I bought it, but in the last year it has become quite difficult to find. My fish are very messy fish species and some are too small to get past the flakes. The combination can lead to cloudier water, but is not yet suitable for water changes. It works quite quickly and easily without much effort for me. I typically hold my filters on for 3-4 hours to see if the "bubblers" or aerators are working well to maintain a gas exchange rate suitable for my fish.
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