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I've seen discussion about crushed bricks as a soil additive but I haven't seen the same for concrete. If this is a well trodden path, just point me in the right direction. I know the issue is mainly that water retention is pretty low for high fired bricks, plus there doesn't seem to be the...

This is my first Spring practicing bonsai and I'm wondering where everyone gets their soil supplies from? Last Summer I bought pumice and akadama from ebay and was not impressed by it's quality. I want to buy in bulk, none of those small 2 quart bags. I'm also curious what size akadama I should...