I got a question. I have 2 bathroom upstairs and running direct water from meter. So if one bathroom flush the toilet, habislah cannot take shower in the 2nd bathroom. I am thinking of installing grundfos but told by plumber that me house is >10 years old so afraid the piping might not tahan and leak or burst. Told better to change pipe. Pipe either outside the wall which looks ugly or kena hacking wall and tiles.

You think plumber is correct?

I am concern dont know where bocor and after down stair ceiling start having stain. Experience once when I renovated my toilet. Idiot contractor told me no need water proofing. Then start seeing stains on ceiling downstairs. Called him and came once to fix but didnt stop . Subsequently dont pick up phone. Have to call another contractor and told have to re tile with water proofing. Almost double my cost.

So coming back to waterpump, seems its true and only way is to change pipe...