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We had a new septic tank put in 4 years ago, and the guys that put the tank in told us to stay away from Ridex and other cleaners. They said the best thing to use is 1qt buttermilk every 1 1/2 months down the drain. They also said to help keep the ph levels ok for the active bacteria in the tank is to use baking soda (small box) once every 2 months mixed with water and pour down the drain.
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