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 the filter or strainer of the pool pump is blocked, this increases the water pressure in the pump, which can damage it. You can reduce the pressure in your swimming pool pump by cleaning out its filters. Turn off your pool pump and filter. Open the pressure relief valve to lower the pressure in the pool pump. When the valve is opened, water will be emitted but will slow to a trickle and stop after a few seconds. This is normal.