No no no no no no Amos. This is Folk wisdom, and experience speaking, not just a-priory, pseudo science...:^) ... I may be an idiot, but I DO tend to compact the refilled soil... noticing the inconsistancies in the result... and mind you I've personally dug enough to be in China right now... You oughtn't deny me my own and other's personal experiences... Mystical Schmistical... there's more to it than meets the well trained eye! Reductionist theories are just as pathetic as tabloid astrology... Keep an open mind, and a ready heart! ttr