This chapter describes the principalorganizations involved in national security space activities, concentratingon the Executive Ofï¬ce of the President, the Department of Defense, theIntelligence Community and the Congress. It provides an assessment ofhow well this structure now serves the nationâs interests in space.
Reduce Pool Water Hardness. 1  Take a water sample from a depth of at least 12 inches from the water surface. 2  Add a reagent from a hardness test kit to the water sample and check the result against the guide provided by the test kit manufacturer. 3  Drain some of the water in the pool if the water hardness level is too high. Add fresh water to replace the water you remove from the pool. Collect another sample of the pool water and conduct the hardness test again to check that the hardness is between 200 to 400 ppm.
Quick Answer. Reduce the calcium content in a swimming pool by draining the pool of a percentage of its water, then refilling it with fresh or softened water, or add a calcium reducing chemical to the existing pool water. In pools with a proper chemical balance, calcium levels are between 150 and 400 parts per million. Keep Learning.