Hi guys, I am in the market for a primary torch using a tank. My current favourites are LFM 4tec, Gralmarine 18W LED and Yellowdiving 20W. In terms of price, they are all in a fairly competitive region. My GUE instructor is a fan of Gralmarine, my buddy dives a YD and is happy with it and the guys at Portland Harbour favour LFM. The one question I have concerns the material: they are all built from aluminium with some Delrin thrown in. Let's say I go on a boat dive off Portland with two dives - I'll be fine rinsing my equipment after returning to the harbour or would I need to clean the aluminium between my first and second dive? Cleaning at the end of the day is good practice, cleaning between the dives would be close to a no-no if you ask me. Any advice will be much appreciated.