Picking through a bag of LECA

[bogdan]

Would one have a better chance at growing in s/h if the LECA particles are to be sorted by size? I have a huge bag of 8-16 mm but many of them are more 8 mm than 16 mm, so quite a water-retentive medium. I used this before and at some point the roots would rather grow in open air than going down into the pot, even though I flushed regularly. I am thinking that the air-water ratio was imbalanced due to particle size.
So basically the oncidium intergenerics would get the smaller ones and cattleya the bigger particles.

Any thoughts?

Thanks!