Im gonna Agree with susie here.
Sea salt and "table salt" (or mine salt really) ARE very different in composition, the main difference being that seaslat contains far more different salts then table salt does.
That being said, they are both safe to consume and use in enemas, and as susie said before, both need (roughly) the same amount per quart to become isotonic solutions
(there is a small difference there, but its small enough to safely neglegt.
And as far as I know, the colon doesnt play a part in the absorbtion of salts in the body (why else create an isotonic solution of the body is going to absorb it anyways),
but dont take my word on it, I do know a bit about osmosis, but thats from being a BSc in chemistry, not gastro-enterology 😜
To sum it up: I do think its safe to play with seasalt, but tablesalt is just fine, and you wont notice the difference in taste when it comes to enemas...