We have a septic system with drain field and have a salt based water softner. The house has been around for about 14 years without any problems with the system. The person who inspected the house when we bought it did not like the idea of the "brine" going back into the septic system because he thought it might interfere with the organisms which break down the waste, but the septic guy didn't notice any extrordinary problems (extra water, waste not broken down, etc) when they pumped it a couple of years ago.
Mchael
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