A flowform as part of the wall of a modern pond

I spotted this 'flowform' feeding water into a pond. There are a lot of these flowform designs around our area as they are made near Nailsworth. Apparently they aerate the water as part of a purifying process. I think it is a notion originating from Rudolf Steiner, whose works I'm not a fan of. But I like the effect of the swirling water. 

The wall is at the base of a very steep slope and is a classic local Cotswold stone wall, where the colours of the stone are a product of the local geology. I expect that the water is from a small spring, of which there are many in such local valleys outcropping between the carboniferous limestone and the over and underlying layers or strata of clay, sometimes being sources of Fullers Earth. This material became a vital part of the 'fulling' processes of local woollen mills, where it helped purify the wool. (Fuller's Earth resembles clay in texture and form, but it is actually a superabsorbent form of aluminum silicate. Mostly composed of silica, magnesium, iron, and aluminum, it has been used for centuries to absorb dirt and oil.)

The quarry is almost certainly within a few hundred yards of the pond. A small stream flows down this valley from Horsley and is a feeder to the more major Nailsworth stream that forms one of Stroud's Five Valleys.