On 4 Jul 06, at 15:41, boutin wrote: > Even out here in my rural part of California it is difficult to buy > large bags of the coarse graded perlite. They seem to only have or > want to deliver the so called medium, which has lots of fines in it. The "coarse" horticultural perlite I buy has gotten much finer the last couple of years. BTW, a warning for those contemplating other sources: don't use perlite sold for insulating houses; it may contain fluorides, unlike "horticultural" perlite. -- Rodger Whitlock Victoria, British Columbia, Canada Maritime Zone 8, a cool Mediterranean climate on beautiful Vancouver Island