WOW!
This really heated up.
I didn't mean to spark a fire.
Sorry to OP for being such a dick, I was half way through the second bottle of wine for the night.
Not an excuse I guess, but at least an explanation. I need to remember to temper myself in those situations.
I don't want to reignite a debate on the various merits and pitfalls of coco, but based on what I see on RIU a lot of people, even ones getting ok results with coco, don't fundamentally understand how coco works. The number of people who use 100% RO water with added calmag is a good example I think. This does work of course, but with a more advanced understanding of how coco buffers and uptakes nutrients and minerals you begin to see that using all RO water with a coco system is usually not the best choice.
Learning to truly master any growing medium is difficult, and there is a big difference between getting good results and getting the best results. Coco can be very simple, especially to someone who already has a good foundation of how to grow a high quality and high yielding plants, but you might as well say that anything is easy when you know how to do it.
A note to the OP about flushing:
Calmag is very important for coco to work properly, it basically regulates the uptake and release of nutrients to the plant. Even when flushing to restore PH a mild nutrient solution including the normal amount of calmag should be used. Flushing w/o the calmag will wash a lot of it out of the medium, this can shock the root system and also effect the roots ability to uptake other nutrients. Alternatively you can look into just using your tap water with coco usually with good results. As long as your tap water has an EC around .4 it will be fine. Even chlorine and fluoride won't mess with coco much. Coconut trees are capable of drinking saltwater if they need to, so coco does not care about a little bit of chlorine or fluoride in most cases.