No, with the indoor it's always a new batch of soil with extra perlite and dry amendments. With the input genetics being so expensive I don't want to take any risks with the breeding projects. The ppm and ph has to be dialed in. But with my outdoor, I'm more relaxed. When I started watering my plants less and less all the usual issues seemed to get less as well. I supplement extra calcium, magnesium and silica along with worm tea with weekly foliar feeds along with Margarete Roberts every week. Green grow organics in George sells a 20L cactus mix for R30 that I mix with the compost or i'll just mix in sand from the back gargen.