Your father appears to be very well managed at this point. I suggest a low salt diet and to limit sodium intake to less than 2000 milligrams per day. I suggest your father continue to follow the advice of his nephrologist. I do not have any other recommendations. The decision to start dialysis must be a decision between him and his nephrologist. I cannot forecast when he might need dialysis. This must be an individual decision based on examining and talking with your father.