You don't need a seperate cooler for a lauter tun and a sparge arm if you're going to fly sparge, it's just a little easier. I don't have either. I just heat up the sparge water in another pot and then carefully pour it one quart at a time on top of the mash with a 1 qt. pyrex measuring cup. I have a 5 gallon cooler for a mash tun, so the grain bed is nice and thick. No problems with channeling or stuck sparges.
Fermenting:#160 Apollo/Calypso Pale Ale
Kegged:#153 Old Helicon Barleywine 2013, #157 Irish Red, #158 Mosaic IPA, #159 Bravo/Delta ESB
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