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A basic outlet baffle tee is the minimum protection every septic tank should have. It is a PVC tee fitting that extends below the liquid surface in the tank, drawing effluent from the clear zone rather than off the top where the scum layer floats. If you open a tank and there is no baffle tee, install one before you leave. It is a $10 part that prevents thousands in drainfield damage.
$8 - $15