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depends how much other grey/black water is going into the tank to dilute the 10 gal of salt water....you could upset the biological chemistry in the septic tank - do you get it pumped out annually or additives (bacteria etc)? If you dump it into the outside, the salt will eventually build up unless you have enough rainfall to leach the salts farther into the ground - usually causes grass to turn brown as we had a salt water pool (no chlorine) and backwashed into the backyard and where the drain from the pool hose was the grass hasnt grown back yet...
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