Aluminum foil or Screen?

From my experience aluminum foil is definitely the way to go. The only use of screens I have so far is for creating a cushion of air on a fruit bowl so that the apple or pear does not caramelize as quickly. The best aluminum foil to use is Reynolds HD or regular Reynolds but two-fold. You may ask "Why?" well because using only one layer of cheap foil would give the shisha more heat and it would singe and/or burn faster. The key to big clouds and great flavor is heat management and with double the protection you cannot go wrong!