I plan to flush my soil every 2 weeks so hopefully that wiill take care of the salt build up.Just used it once so far.I read that would help on a mg def. and most plants eat up alot of that.i added a 2 tsp. to a half gallon a fol. fed. Just wanted to see if thats y the leaves were yellowing around the leaves.I didn't use all of the solution that i mixed, just a misting on them.So as long as i m going to flush every 2 weeks i should have no problem w a salt build up rifgt??So what have u used for any mg def.? I do everything to a minuimum w any mixing of solution cause I know u can always add it later but can't take it out!! Thanks for the advice tho..APPRECIATE IT!!