cover on the tank.
drop a few drops of food coloring into the tank and leave for 30 minutes.
if there is food coloring in your toilet bowl when you come back—you have a leaky toilet.
there can be many reasons why your shower has low water pressure, however, it can often be due to a dirty shower head, a problem that you can easily fix.
unscrew the shower head and remove the spray plate.
soak the spray plate and shower head in white vinegar for 3-5 hours.
brush off any loose dirt with an old toothbrush and rinse all the parts in clean water.
re-attach the spray plate and shower head and enjoy the increased water 