I recently purchased a larger brew pot that allows me to do full boils. I also finally broke down and purchased a 25' immersion cooler. OMG, I wish I had known 12 months ago how well these coolers work! I did my fist BIAB and had 5 gallons of wort. Immersion cooler took it down to upper 70's in less than 15 minutes. Now granted, it is still fairly cold here in Missouri and the water running through the hose was pretty cold, but the previous 5 gallon batch I cooled in a tub with ice water took almost 40 minutes. Thought I would post this for anyone who has been considering a cooler, but has been putting it off. For me, it was money well spent!