I had to go saltfree for a while, about 4 years ago, due to kidney problems. If you cook your own low carb meals, roast your meats and chicken, etc just dont use salt, use lots of herbs and spices and lemon or lime juice instead of salt.
Make sure you eat plenty of low carb veggies, they contain potassium which would help to lower blood pressure, avocados in particular, oh and nuts, like walnuts and almonds are heart and blood pressure friendly.
I was told not to overdo it with protein, to increase fat and vegetables. I am fine now, am using salt again.