The Pool Calculator recommends a value to add to raise PH using washing soda (sodium carbonate) I have a very large bag of sodium bicorbonate (baking soda) left over from the previous owner and am wondering about using that. It's my understanding that sodium carbonate is more caustic than sodium bicorbonate. So is there some way I can convert the figure for sodium carbonate into sodium bicarbonate untill the quantity I have is gone? Thanks