Anyone out there ever use a water lance to sink pilings? I've used a garden hose attached to the end of posts to sink them 3-4 feet into sand. However, I want to build a 2 level free-standing deck and I want to get the pilings set about eight feet into the sand. After setting the pilings I would install diagonal bracing to prevent lateral movement. I know about checking with local codes, etc. There have been several fatalities involved with collapsing decks. Most of these have involved inadequate deck-to-ledger connections.