My husband installed the highly acclaimed Caroma dual flush toilet. and it has yet to leave clear, clean water in the the bowl after the flush. He says it has to do with how long you hold the button. this can't be for a toilet of that price! Sometimes the water is dirtier than others and often it takes two full flushes to clear and then the water is not fully clear (it looks murky). forget about using the half flush. I know nothing about plumbing but he refuses to help find out why it does this. Can anyone help?