We've decided to go with in-ground vinyl. We would really like a SWG, but have been discouraged multiple times by various pool people. They're reasoning was that salt is corrosive to equipment, it voids many manufactures warranties, and can eat away at decking. Both a pool frog and bromine were suggested as alternatives that are not corrosive. We've ruled out the pool frog after much research, but would like input into the pros and cons of bromine. Also, any thoughts on SWGs would be appreciated also. We are tentatively planning to go with bromine, as the extremely reputable pool builder we have chosen recommends.