Des,
Have a look at this site - I use the 1 gal Injection molded root maker pot in white plastic container. (Commom food tubs) I put my holes in the white tubs. The white color helps reflect heat which also helps.
RootMaker, The Original Root Pruning Container System. Another place where they make pots and containers to grow trees
RootMaker, The Original Root Pruning Container System. Might be hard to get to SA but the ideas are useful. Am using a gravel here which is heat expanded shale -used to make Precast Concrete structures Called "Stalite". I am delighted with the results. It retains 30 percent of its weight in water - is pH neutral and does not have the dust that gives me astma like pearlite. Several commercial growers are useing it in Florida for everything from Cattleyas to Paphs. I understand that some lumber yeards sell it a Expanded shale. At first I mixed a lot of CHC with it but find that is work it works well at less than 25 % CHC and 75% Stalite for cymbidiums. Will reduce CHC even more in the future but cant vouch for its as a sole component of the mix. Its cheap! The one thing that might be considered a drawback is the weight - If you carry a box with very many potted cymbidiums in it you will strain your family jewels - on the other hand the pots will not blow away in a wind storm.
For the person who wanted Cym Flasks - have you looked at
http://www.orquideas.com/ ?
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