We are about to purchase a pool and the Vision Nature2 system comes with it. I have not seen good reviews on this. We are trying to determine between a chlorine system or salt system. The more I read, the more I get confused. I read the BBB system but I really do not want to use bleach. Our skin soaks up so much, my kids have allergies & eczema already, I don't want to aggravate it. I understand salt produces chlorine but it has to be healthier than bleach?? Maybe I am misunderstanding - please help! Also, if we went with salt, could we convert to the BBB method down the road without having to drain our pool and re-fill?