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.
When your pool water is too soft, you can raise it by adding Calcium Chloride, or the less common Calcium Carbonate. Commonly, this is sold under many brand names - commonly referred to as Calcium Hardness Increaser. You could also use a snow melt product, but make sure it is 100% Calcium Chloride or Carbonate. Always read the package instructions, but generally speaking, adding at a rate of 1 pound per 10,000 gals of water will raise your pool Calcium Hardness level by 10ppm.