My cold brew maker use a metallic filter, but I also bought a pack of paper filters to try out. I haven't noticed a sour or off flavor when using the metal filter, and use it almost exclusively, fwiw.
How do you use the paper filters? I have on of those but apparently while in a rush one day I threw out the metal filter with the grinds and can’t get a replacement here in the uk.
I make my cold brew in a plastic and glass contraption that produces a drip onto a reservoir into a bed of grounds that has a metal filter on the bottom. I can't say I have ever noticed a metallic taste to the coffee. I put an aeropress filter on top of the grounds to help the moisture distribute. I suppose you could do the same at the bottom to avoid direct contact between the grounds and the metal in the filter, if it was a concern that some kind of reaction might take place (that wouldn't otherwise take place in the presence of ~0C water + dissolvables).
I do a very primitive method - I stir coarse grinder beans into the water and let it rest in the fridge for roughly about 12hrs, then filter it with a coarse cotton filter and then with a permanent dripping filter.
The result is great, but the effort is high.
Maybe I just let it rest in the French press and compare the result.
I bought some large paper bags on Amazon that work like tea bags. It takes longer (I usually let it sit for 2-4 days) but the effort is extremely low. And you never need to use any metal :)
That'll work. I will have to try that myself to see whether immersion vs percolation in cold brew makes a difference.
Like the ConbatWombat, I use a glass and metal French press. I guess the metal screen and rod are mostly "above" the coffee until it's time to pour. I don't think I would make cold brew in a regular metal container because the acidity would eat the metal.
I would also imagine the stainless steel in a French press is optimized for coffee, whereas if you made coffee in say a metal mixing bowl which may not be designed for acidic environments......
Don't over think it.
The best way to know for sure is to experiment for yourself and double-blind taste test to see if you can tell a difference.
Some people are sensitive to drinking out of metal but I've never heard of a metal filter imparting an off taste unless it isn't cleaned properly.
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