Basic 18m x 10m Underlay

I expected a fleece underlay and got something similar to the weed control matting you can buy. As we left the old butyl liner in place, it didn't really matter but I wouldn't be confident this underlay would do a good job in a pond the size of mine (15m x 5m). Next time I would spend a bit more and buy the better quality underlay.

Fine

useful protection for the pondliner