This is probably not salt, Check your PH it is probably too High. salt water pools constatly generating clorine and it tends to bring PH up quikly, and it makes this white chalky stuff. I'm gessing that your return is through your spa to your pool and it accumilates at the bottom of spa. I would also just run the spa and add part of the acid that is needed for spapool combo. (after you get your readings of how much to add to your spapool). After you add the acid in the spa brush it to stir all the white stuff. Within an half hour run your pump to the pool to circulate the pool water also.
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