YES! Do put an aerator into your 2nd pump tank. your setup is perfect for an aerator. YES! You can save a lot of money by using the sodium percarbonate the 1st time as opposed to 30% hydrogen peroxide. Sodium Percarbonate worked like a miracle the 1st time for me. Percarbonate should get your field operational again, and then aeration should keep it operating. After your aerator goes in, I now think worms will also help keep it operational.