How to Kill Weeds With Rock Salt | Home Guides | SF GateRock salt and table salt are both made of sodium chloride. Table salt is finely ground, purified rock salt. Rock salt has a gray tint because it's unrefined, rendering.rock salt ground,pavers - Can salt be used to control weeds permanently .Sep 17, 2012 . Is salt an effective way to kill all (or most) plant types? . Will using salt affect ground water (I have a bore) and nearby .. Rock salt or table?
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