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Its really not a big deal unless you've got a ton of reef gallonage.
Dropping 20 gallons of salt water into a 1000g septic tank that typically has 750 gallons of water in it and has about 500 gallons of water a day going through it just isn't meaningful.
There are a couple of states that require the waste line of softeners to be discharged into septic tanks - and they don't seem to have any higher failure rates than any other states.
The one thing I wouldn't do is dump about 500 gallons of salt water into a septic tank all at once - fresh water floats on salt water, and if they don't have time to mix, you'll float all sorts of 'stuff' into your leaching fields.
Also if you dump it in the sink the salt is going to eat your metal drain plugThe bigger potential problem is the salt water from water changes. Most septic tanks are concrete, which does not take kindly to the corrosive affects of salt.