It eventually leaves salts which is how it delivers the nutes. You can rinse out coco and reuse it, soil not so much from what I understand. I’m a Coco grower.

Thanks

Time released nutrition like Grow Dots will eventually run out. Insoluble salts should not form when they’re not concentrated in a reservoir or concentrated in the soil during dry backs. I would not be concerned with salt build up when using Grow Dots when evenly dispersed through the soil. You can reamend the soil after each cycle and mix in more Grow Dots for another run.

I’ve used Grow dots for several runs in coco. I just replant directly in the same pot and add more Dots. The old ones are used up by the end of flower if you time it right. I don’t wash my coco in between runs.