This is from a bonsai perspective, and he is "ranking" in terms of wanting to retain moisture, but the underlying info is useful when adjusting a soil mix to get the right amount of drainage for your goals.
Organic Rankings:
1. Coconut Coir: 129g @ 14.57% loss
2. Compost: 26g @ 31.58% loss
3. Pine Bark: 22g @ 33.33%
4. Commercial Peat Moss: 6g @ 40% loss
Inorganic Rankings:
1. Diatomaceous Earth: 37g @ 30.19% loss
2. Akadama: 22g @ 26.67% loss
3. Kanuma Pumice: 22g @ 29.03% loss
4. LECA (Turface): 30g @ 36.17% loss
5. Vermiculite: 28g @ 41.67% loss
6. Perlite: 14g @ 36.36% loss
7. Sand: 12g @ 67.56% loss
8. Lava Rock (Scoria): 4g @ 76.47% loss
9. Expanded Shale: 2g @ 84.62% loss
10. Granite Chips: 1g @ 94.44% loss
If you are using granite chips sieve the fine dust out. That sold in the UK by builders suppliers is usually quarter inch to dust and if you leave the fine dust in it sets like cement.
The peat moss he uses is different to our moss peat which I would think would more approximate Coconut Coir in it's water retention? However as we all know if plants are in peat soil alone they are difficult to rewet if allowed to dry out. The same problem he had in the video. Mixed in with other potting soil components it the peat wets easier.
