Free shipping on orders over $100 from J&L. Thats what I did, but I understand if you're trying to support local business.
Two of us in PG have used it when magnesium salts didn't work to kill off bryopsis. I still amazed that it actually worked. I just wish I did it years ago! I only went as high as 1500ppm by adding about 200ml a day until the jugs ran out.
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