I have been thinking about switching to the BBB method but I am concerned about the cost. Currently, I just use Xtra Blue Shock ($4.99) once every two weeks and a chlorine puck in a floating chlorinator(sp?) and change it every two weeks ($2.99) and that keeps my pool crystal clear. So on average, I spend around $16 per month on supplies. I need to know how expensive is a testing kit and how many uses I would get out of it. Also how much baking soda, bleach, or borax would I need for a month and the estimated cost. My pool holds 5,061 gallons of water and is an 16' X 48" Intex Metal Frame Pool with a 14" Intex Sand Filter. thanks.