couple of weeks ago i fitted a pump to increase pressure to a shower. I routed the hot water directly from the cylinder as per the instructions. Originally the showers hot water was fed from the same pipe that supplied the bath n basin. I removed the pipe section to the shower & capped it off. So now i have a 100mm pipe section, full of water, that goes nowhere. Is this gonna cause problems? salmonella legionaires or what ever!?