Why some dialysis patients no need take the Binder?

Why some dialysis patients no need take the Binder ?

Phosphate binders are prescribed when patients have high phosphorus to protect their bones. If patients are able to limit the amount of phosphorus in foods they eat or they do enough hours of dialysis, the phosphorus level in their blood may stay in the target range. However, most patients have to take binders when they eat to keep their phosphorus in range.