LARGE vortex gravity bong

hey guys i have been checking out vortex grav bongs and i went downtown to the shop today and they had a 3 footer! this thing looks to be twice as big as the regular ones, it was $125 so i grabbed it, for only $25 more i got twice the size

i figured out the best ways to use the thing and found that it produced EXTREMELY smooth hits and still gets me realll buzzed

my question is, to those with vortex experience... how do you clean these things?? after one use the inside began to smell terrible, the water takes so long to drain through the carbhole, it takes like 1.5L to fill up. there is no way to disassemble the vortex, how do i get the smell better?