I also tried. it works. however, the problem is the water contains much steel element. really have keep doing periodically.  n thanks for telling the handling here!

r u solve your problem???? no thanks...

I tried to clean the water tower inside, but still the water is very smelly...  

who can help pls?

Can the problem be solved with replacing the existing toilet with a new one?  I'm pretty tired of cleaning the toilet so often.