Has anyone else noticed their espresso getting sweeter after switching water filters? Not a snob thing, genuinely curious

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Wait, actually the filter might not be what's changing the sweetness. I noticed the same thing after I switched mine, but then I figured out it was because I started using fresher beans around the same time. If your water hardness changes, that can affect extraction, but it usually makes things more bitter or sour, not sweeter. Sweetness in espresso mostly comes from how the shot is pulled, not the water. You might want to check if your grind size shifted a bit when you swapped the filter, that can make a bigger difference than people think.