Sorry for the late response, I’ve been on vacation and hardly picked my phone up for a week…much needed!!!!!
You do get some salt buildup using AutoPots which forms a crusty layer on the top of your medium and on the outside of the pots. Luckily I haven’t had any issues from it, likely due to shorter grows. My plants get 1wk to get adjusted to the system before I flip to flower bc they get too big otherwise.
After harvesting I scrape the crusty top layer off into the trash then rinse the rest of the medium really well until the water runs out clear. Once it dries I reuse it for my next run. When I started using the system in 21’ I bought two big bags of Mothers Earth Coco and just had to order another bag two grows ago ðŸ‘ðŸ»