Hi bro,

For double storey houses, 1st floor toilets water pressure is rather low because the water tank is only above the ceiling.

I heard people says that if we do not want to install pump, we can also by-pass the pipes by connecting direct to the incoming supply pipes.
By so doing, if syabas no water supply come, the toilets also no water?
Or will it automatically use water from the water tank?

Briefly, how is the modified connections like?

True also. Imagine if we use water from direct water meter, then our tangki water will be stagnent, and it will be there like forever.

Let say 1 yr later, when we wanna use, imagine the quality of it leh.

True also.
Whether install water pump, or connect thru direct pipe also will increase the pressure. But the fear is leaks at the conceal pipes.

3rd option is to install water heater c/w pump at each toilet.