It is believed over 80% of all swimming pools leak, it is just the seriousness of the leak that differs. If you think your pool is leaking the first thing to do is complete a bucket test, a video of which can be found on the website, showing clear instructions on how to complete it.
A swimming pool, during the Summer months, if it is not covered by a pool blanket, will lose on average 8 ? 12 millimetres of water a day. This is dependant on how close you live to the coast.
Regular filling of the pool, (more than once a week) is the surest sign of waterloss, or constantly having to add chemicals to balance the pool
Here is a list of the main causes of pool leaks and their warning signs