I had a similar infuser (I guess that's what you'd call this) to make cold brew and it did not work well. I suspect that it is the fault of the filter. Having a filter makes it easier to clean, but the coffee does not diffuse as well into the water. I suppose that's why the traditional method (look up any cold brew how-to) involves simply putting the grounds straight into the water, and then filtering with cheesecloth or the like after. I would not recommend this style of making cold brew.