The house has a downstairs toilet only. I want to put one in the bathroom which is directly overhead. There is a waste pipe from the bathroom down through the reinforced concrete floor. The floor is 18cm thick. The hole for the waste pipe is about 5cm dia. I do not want one of the electric toilets which would grind the waste up to pass down a small pipe. So I need to make a 10cm dia hole in the reinforced concrete. What is the best way to do this?
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