The selfish capitalist in me wonders, if it's not costing you anything, why are you worried?
What makes you suspect the leak is in the pipes? how big is the pool and what's it made of?
Can you for example, drain the pool, and fill it for just 50 cm. leave it for a day. and see if the water level decreases dramatically? if not, then increase by 50 cm per day to zero in on the point of loss?
Heck,
My Pool doesn't loose/leak water "Significantly" every Day of the Year, but on some Days it is very significant,
so much that I really need to walk several Meters closer to it's edge before I can get my Feet Wet!
Why???
Hey,
I needed Years to figure out who and where is steeling My Pool water on so many Days,
while on other Days of the Year it is just "Overflooding" without Me leaving any waterhose open,
but at least I figured it out, finally.
They name da Thingy "Tidal Changes",
on good days I step off the Veranda and get my feet wet right away,
on Bad Days I have to walk further down the path before I can touch the good stuff.
I just still couldn't find da lil Hole in da darn Atlantic Pool here in the Backyard, but I don't give up the Search.
Mike