Personally I wouldn’t sweat the Po4 and chase the numbers.
But if your looking to get the Po4 down I’d use the gfo but use less of it.
Your bound to see some changes when adding rock. The system will adjust. A little carbon dosing wouldn’t hurt.
But if your looking to get the Po4 down I’d use the gfo but use less of it.
Your bound to see some changes when adding rock. The system will adjust. A little carbon dosing wouldn’t hurt.