I seriously doubt that the flush is what caused his plant to get sick... obviously it was the poison and the mis-instruction given to him by the ignoramuses at the shop he bought the poison at.
a plant that big could be transplanted to clean soil after washing away all the contaminated soil, and prune it a bit as well.
good luck
a plant that big could be transplanted to clean soil after washing away all the contaminated soil, and prune it a bit as well.
good luck