So far as I can see from the specs. there is very lttle difference bwteen the salt water
rejection versus Filmtec. Both Toray and Filmetc use polyamide film in their membranes. Certainly would not pay 5x more. Plus Filmtec are generally easily availbale at significant discount. You can afford to carry spares!! Biggest problem we had with our RO was prefilters plugging.