Is your shisha tastingkind of funny lately time after time? Do you change the water and clean the hooka often?
Could¬† be the hose you use is rusted or just too old. Check out these hoses at Smoking-Hookah.com including the washable plastic hose which is THE ONLY hose that is really washable and won’t rust no matter what you are told, they will al rust or ruinbeing washed, except the p.v.c. plastic hose.
http://www.smoking-hookah.com/Products/Hoses/New-modern-Egyptian-hose.asp¬†Here are all the hoses on their list