I don't know if I oversimplified this but basically I started to dose when stuff got depleted faster than I was replenishing it with 10% weekly water changes.
Kalkwasser has been an easy solution for me (timed ATO) but I also use two Salifert products in addition to that. For some reason my clams and coco worms seem to be really into building scutes and tubes and they appear to be sucking the stuff right up.