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I go here (New Malden): https://www.calorinsurrey.co.uk/products/co2-gas Can't remember what the initial cost was but now I've got a cylinder its £20 for the 6kg refill which lasts forever.

Yeah, I've tried that loads with both fans and it's always off or too fast. Thanks though.

I've built one of these using this Potentiometer: https://www.ebay.co.uk/itm/DC-Motor-1-8V-3V-5V-6V-12V-PWM-Speed-Controller-2A-Potentiometer-Knob-Switch-SF/362720085707?ssPageName=STRK:MEBIDX:IT&_trksid=p2057872.m2749.l2649 When I connect it to the fan, it doesn't turn unless I turn it up to...

Hi, I know this an old thread but I had a question about the IBUs from the hop stand / whirlpool. I recently did a hop stand for about 40 mins at (I think) 80 degrees (probably a bit more), and the resulting beer was more bitter than I had been expecting. In my calculations the flameout hops...