i feel kinda bad for u guys who say they love swimming at the beach because i could see it from my house

, only time i went was every other day last summer when we were body boarding and we all had those wet suit type shirts so it covered my body acne. plus we have some of the best beaches too in san diego, im like 5 min away on the freeway. but back to the topic...
as for messing up ur plumming, etc, look up "hard water" and "soft water." the sea salt im using happens to be for "water softening" for houses. unlike most of my friends, we have a water softener tank in our garage that u fill up with salt that softens the water, we dont use it anymore i believe cuz we used to fill it up with salt at least once a year, not anymore. so yeah, u could use the water softening salts like at a home depot or lowes(i never went there but they should have it) as long as it says 100% evaporated sea salt on it u should be okay. what i looked up since the salt was for the softening process is that it is better for ur pipes. but yeah, look this up.