Leaky Toilet

Could hear the faintest sound of both toilets perpetually refilling. So faint that it was only audible during the quietest times of night, or if specifically listening for it. Finally realised what it was, and replaced the plunger seals on both toilets. Took maybe ~10mins each at a cost of ~$2.50. Problem solved. A staggering amount of water wasted...and future money saved.