ezion, I think the max size of HDB is actually 3ft.. so most of us fail.. but as long as no one complains (neighbour) u shld be alrite.. I had a HDB inspector in the hse and she ignore my 6ft... so I guess they will close an eye.. as for the corrosion of pipes, u have to see the location, I experience higher corrosion rate in the eastern part of SG.. u dun really have to own a s/w tank.. u have to see the pipe...
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