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Your doctor typically orders blood tests for you during a physical, checkup, or an appointment intended to screen for a specific condition. It's possible to order your own blood tests without a doctor through laboratories like LabCorp and Quest Diagnostics, but health insurance may not cover these tests.

There are two ways to increase your hot tub's alkalinity level: sodium bicarbonate (baking soda) or any type of alkalinity increaser product. If you choose to purchase an alkalinity increaser product be sure the product is made from sodium bicarbonate, which is the main substance used to raise pH.