refreshing potting mix?

[glevin8588]

Hey, long time and happy user of the EB system now with 24 boxes.  Just curious how others refresh their grow medium between plantings?  I typically replace the potting mix after 4-6 harvests (1-2 after tomatoes) and use an extra quart or two of organic worm castings + the expected dolomite and fertilizer.  Anyone else use worm castings or anything else to replenish the medium?   Thanks! 

[gardendoc]

I've got 136 and fluff and add some new mix with every replanting, plus the usual dolomite and granular fertilizer

[Darla1949]

I have red worms living in my earth boxes, so they keep on producing new castings.