Nutcut, just how I always describe a pond, an 'ole in t'ground wi' warra init. Innit !
At present, wor pond is crystal clear, some natural weed clinging on to life aroond the sides, and I dare say, in a couple of months, there'll be some spawn from the local frogs filling it oop. I cannot say I am overly enamoured with that slimy green stuff that comes and goes over the year, but, it is the natural way of things. I simply remove a bucket full of it, and dig it into some trench somewhere on the lotty, and off we go for another round. Ding bloody ding ! As we have a sort of N facing slope, growing season is somewhat curtailed by cooler days, poor drainage, and a shorter growing season, but we manage.