An alternate source for pumice is the local landscape supplier; other useful things they often carry are bark, sand and local soil. One of our local suppliers has a price category for home hobbiests of $3.50 per garbage can full (about 32 gallons U.S.) of most things they sell. Many places will sell you a 5 gallon bucket full for a reasonable price. Admittedly, I have to run the pumice through a 1/4 " screen, but then I have two useful sizes to work with. Dave Brastow - Tumwater, Washington (U.S.A.) Where we have a lot less backyard, and a lot more lake than usual. 6 1/2 ' of rain on top of 18" of snow! And not to complain, but when the garage roof leaked for the first time, why did it have to aim at the seed storage bin and fill it with an 1" of water? Guess what I'm doing today!