The SepAerator™ Septic Tank Aerator | Fix Septic System Problems and Failing Septic Systems, The SepAerator™ Septic Tank Aerator. Add to your existing septic tank to fix a failing secondary treatment systems such as drain fields, mound systems, leach beds, sand filters, etc. The SepAerator™ will restore and prolong the life of your septic system and leach field.