Wastes with a pH of less than 2.0 or greater than 12.5 are considered to be corrosive. The EPA defines corrosive wastes to include (1) aqueous waste exhibiting a pH of less than or equal to 2 or greater. than or equal to 12.5 and (2) liquid waste capable of corroding steel at a rate greater than 1/. 4 inch per year.
Vitamin D is important for the absorption of calcium from the stomach and for the functioning of calcium in the body. Calcium and vitamin D combination is used to prevent or to treat a calcium deficiency. Calcium and vitamin D combination may also be used for purposes not listed in this medication guide.
The most common calcium supplements are made of carbonate, citrate (which is easier to digest than carbonate), dolomite, di-calcium phosphate, tri-calcium phosphate, coral, oyster shell or bone meal, and all variations of amino-acid chelated calcium (which are the most bioavailable of all the above forms of calcium).