First of all, 5:1:1 is not a recipe, it is a concept so you can adapt it as per your needs. If you soil mix drains too fast and you want to avoid too frequent watering due to hot summer then you can increase the ratio of fine particles which retain water. I did read that coco husk chunks are not a replacement of bark in fact there is no replacement. Pumice or perlite will surely add aeration in soil but they are still not a replacement of bark. But i do not garden in pots so perhaps a pro might be able to help you.

I use the 5-1-1 in northern California, where our hot season runs from May to October. We seldom get a drop of rain during that time. The most I've ever watered is once a day, and only when the temp's are over 90F. The trick is to use an appropriately sized container. A micro bonsai container will require frequent watering, regardless of the chosen mix. Also, applying a thin mulch will help reduce moisture loss.

Josh

@greenman, thank you. Your reply answers the question regarding watering and moisture retention.

But i am still confused about which ingredient to choose for large particles among these: perlite (not coarse, it is 0-5 mm) or pumice (not horticultural grade, but small pumice stones, will need to crush them to make them gravel size) or coco husk chips. Most of my plants are 2-3 years old with their root ball in clay only. So i will be putting out all my plants remove clay around them and re-pot in same container with new soil mix around them. I know i cannot have perfect 5:1:1 due to absence of bark but i want to avoid the problem of root root and lack of oxygen to roots. Thanks.