Yup, I follow the recipe almost exactly, 600 grams of baking soda measured on a scale, laid out on a cookie sheet ontop of aluminum foil (so I don't cross contaminate with pie goo or something
). Bake it for an hour, and pour into container (with air filters on since that stuff seems to get airborne quite easily). 1 gallon of RO/DI water, shake, and usually wait a day before dosing just to make sure it's as dissolved as it can get.
How I figured on that much? Well basically dosing and seeing no change at all (and sometimes drops) figured I'd up the ante, and dose a lot just to see how much of an effect that'll do. It didn't do much, calcium did have a change, it usually raised 20ppm in a day however.
When I make saltwater, I just add the salt to a garbage can full of RO/DI water, I don't add anything else to it, when I do water changes.
Could I be adding too much? Sure it's possible, but I don't just dump it in, I have a drip system which does 1 drop every 1 to 2 seconds.
Eitherway ,sounds like Oceanic might be a bit suspect, time to switch back to IO.