The attached article should answer many of your questions.

Here is a link that might be useful: container citrus

FWIW I am using the Al's Gritty Mix for a Meyer Lemon in a pot and it is doing fabulous.

1 part uncomposted screened pine or fir bark (1/8-1/4")
1 part screened Turface
1 part crushed Gran-I-Grit (grower size) or #2 cherrystone
1 Tbsp gypsum per gallon of soil (eliminate if your fertilizer has Ca)
CRF (if desired)

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I made some substitutions due to availability of components.

For Turface I used the clay-based oil spill cleanup material they sell at NAPA Auto Parts. It's similar, but I am not sure which one at the moment. It should be one of these: NAPA Oil Spill Cleanup Materials
It's not the Diatomaceous Earth for sure.

For granite\cherry I found a pea gravel where no particle is larger than 1/4". It is mainly tiny stones of quartz and feldspar bits. Seems to do the job.

You should check this article, they answering question via email too.

Here is a link that might be useful: GreenHouses