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.
If the pH is LOW-under 7.0 or lower-your pool will naturally and chemically consume more chlorine. That's just how water chemistry works. Low pH, higher chlorine consumption and use. High pH, lower chlorine consumption. For this reason, you need to maintain a pool pH of 7.4 - 7.6 for optimal chlorine consumption and use.