Water Balancers: To keep your water in balance, you should test the pool several times per week for chlorine and pH levels, and adjust as needed. Test total alkalinity every few weeks or if you have pH troubles, and test calcium hardness and cyanuric acid levels every month. pH Increaser: Granular Soda Ash.
The alveoli are surrounded by tiny blood vessels, called capillaries. The alveoli and capillaries both have very thin walls, which allow the oxygen to pass from the alveoli to the blood. The capillaries then connect to larger blood vessels, called veins, which bring the oxygenated blood from the lungs to the heart.
alveoli tiny air sacs at the end of the bronchioles tiny branches of air tubes in the lungs the alveoli are where the lungs and the bloodstream exchange carbon dioxide and oxygen carbon dioxide in the blood passes into the lungs through the alveolioxygen in the lungs passes through the alveoli into the bloodnih national cancer institutehe alveoli are where the lungs and the bloodstream exchange carbon dioxide and oxygen carbon dioxide in the blood passes into the lungs through the alveoli oxygen in the lungs passes through the alveoli into the blood nih national cancer institute