My copper in slab just started leaking again so not going there. I want to use good pex in attic. I am on well. Hard water. I know thats what caused leaks. Also been there 33 yrs. I cant afford expansion tool for plastic fittings so Im gonna have to use the brass fittings i guess( feel like they gonna leak mayb 10 yrs). Which ones and which compression ring? Stainless or crimp ring..You're opinion on any and all of this would be appreciated.also thinking about a filter of some sort.