Hey fongas brew. I use a copper IC in a 45lt batch. Easy to clean/sanitise before and after each use. I spray it with the garden hose after use and give it a look over for any crap that might stick. Before use I look it over and hose the dust of it and then sit it into the hot wort at flameout. It drops the temp pretty quick and more so if you recirc the hot wort past the coils. Like chesl73, I generally get the last 5-10 degrees to drop by using the fridge.