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I find cold brew much stronger than a regular filter made with my Chemex/siphon.
When I wanted to give it a go without buying special equipment I just used a plastic bottle stuck in the fridge overnight and filtered it through a regular filter in the morning (French Press works well for that stage).
I think I normally used a ratio of around 70g/litre, for anywhere between 8 (at home) to 14 (at work) hours.
Advice for iced coffee - I'm currently making by putting my pour-over in the fridge, but it seems to end up bitter-er than when hot, such that I need to use more sugar syrup than I'd like to sweeten. Should I be looking at cold brew? Can't help but assume that will end up weak but I'm probably wrong!
Cheers