A magical garden

Visited my friends garden today and I must say it looks stunning .
This is just a small part of it, which has a brook running through.......and then I heard what sounded like a toilet flushing, very very loudly.......??????? What on earth was that I asked!!!!!
Apparently she's had some £8,000 cesspit sunk into the ground and they forgot to tell her it would make this flushing noise and more!!!!!!!!!
Oh dear c'est la vie! ( is that good french Combi ? :) )