We read (after putting in the Z tabs) that we should use the BBB and stay clear of the Nature 2 system. We haven't put in the mineral cartridge yet and wonder if we should take out the Z-tab we put in?? Where do we go from here?? We have a 27foot AG pool and the rest of the water was put in on Wednesday. We had the electrician out today and had the pump running all day. Thanks for helping us!!!!