BTW (By the way) Digger --- you don't have to change your sand every 5 years. I have had the same sand now for 10 years and not a problem. Al has had his sand longer than that and I think Carl has had his same sand for quite awhile, too. There is no rule for needing to change the sand every 5 years. Likewise, don't let anybody sell you any "sand cleaner." No need for that either.