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This is no run of the mill soil mix! They put a lot of thought into it. For those that aren't aware of what's in it, it has bat guano, earth worm castings, fish bone meal, feather meal, greensand, mycorrihzea, glacial rock dust, soybean meal, humic acid and more. All these amendments are ina base of coco coir with some long fiber coco blended in it as well, along with perlite and pumice.... I think the fish bone meal would supply plenty in the calcium department. It seems ta be a -very- well balanced soil mix. I don't think I'd fuck with it, esp if yer plants are showing no signs of deficiencies right now.... I saw it listed for 16.60 a 1.5 cubic foot bag, if I can find it locally, I'm gonna use it! Thanks for bringing to our attention! Good luck! BCthatspoker422 said:I am using Roots Organics Potting Soil. Do I need to add any other calcium source?