Bi-Carb Soda (Sodium Bicarbonate)

System Backwash and flush. Sump drained and flushed to remove waste food etc.
Added rain water to Tank 3 to allow it to settle before rejoining Tank 3 to the recirculation System. Added 200g then 500g Bi-Carb Soda (Sodium Bicarbonate) to act as a pH Buffering Agent.