I have a DD B3-36A 18” that I use with a MK-II pump. Probably overboard for my application. My ground water now is around 46F. I chill 5 gal from full boil to 66°F (lower than 50°F if I want to) in less than 4min. Cools so fast that sometimes I have very little time to control the water flow to get the temp I want. Love that thing. I always clean it about 10-15 min after use. I spend 10-15 min to do a good cleaning with PBW and 132°F hot tap water in both directions. I use a coarse screen at outlet of my M&B kettle just to make cleaning easier. Have done 6 brews with it. I doubt any other tube chiller type would be as efficient with the same water. But yes these need special care. Not for the lazy. If you constantly have a lot of hop/whatever residue yes maybe you should stick with the other type or better yet have both.
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