I have been using this recipe for a couple of years now for my now 200 gal SPS tank. I use a box of baking soda and 2.5 cups of calcium chloride every 8-10 days. I have a dual Aquadoser adding both. I supplement the magnesium portion weekly using the epsom salts/magnesium chloride solution when I do water changes.
This is a very inexpensive and effective solution to buying very expensive pre-made solutions.
Littlesilvermax or Bulk Reef Supply sound like a good source of the materials you need. You can also buy these materials from chemical supply houses, but you are looking at buying 50 lb bags of each at a minimum.
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