How to pool shock
With the filtration system running, slowly pour the bucket of dissolved shock directly in front of a return line fitting. You will see the water being carried out into the pool by the jet of water coming from the return line. Pour slow enough that all of the water from your bucket is carried out into the pool and does not settle to the pool floor.
POOL Shock using chlorine
Balancing the water in the Pool
The three factors mentioned here--pH, total alkalinity and calcium hardness--all affect one another, so it will take some trial and error to get all three in the proper range at once. Also note that before you add any chemical--especially an acid--to the water, you need to first turn on the pool's filter.
Measure the water's total alkalinity. This figure should be in the range of 80 to 150 ppm; 100 to 120 ppm is best. Adjust the total alkalinity by adding sodium bicarbonate (baking soda) to raise it or sodium bisulfate (dry acid) to lower it. With a pH tester, measure the water's pH. The proper pH for a pool is in the range of 7.2 to 7.6. To lower the pH, add sodium bisulfate or liquid muriatic acid. To raise it, add soda ash (sodium carbonate). Add more chemicals as needed until the water is in balance.
Treating water with chlorine
Scoop chlorine granules into water in a nonmetal container, following package directions. Always wear goggles and rubber gloves when handling chlorine, and always put the chlorine into the water--don't pour the water over the chlorine. Stir for about 30 seconds, and leave for 30 minutes to settle. Turn on the filter. Reaching as far into the middle of the pool as possible (perhaps by standing on a diving board), pour the chlorine into the pool. Discard any sediment left in the container. Add chlorine three to four times a week for a pool in heavy use. Occasionally--no more than once a week--you may need to superchlorinate (also called shock) the pool to burn any built-up bacteria, algae and ammonia. Following chlorine package directions, make a solution for superchlorination (it will be three to five times as strong as normal chlorine). Add the chlorine solution to the pool after sundown, if possible, as the sun's rays break down chlorine. Before allowing anyone to go in the pool, test the residual chlorine level to make sure it has gone back down below 3.0 ppm. This will take at least several hours. Keeping the water dirt- and debris-free Remove any leaves from the pool with a leaf net each time you go swimming. Empty and rinse off the strainer basket of the skimmer once or twice a week, and as often as daily during falling-leaf season. Keep the deck clean by regularly sweeping and then rinsing it with a garden hose. Use a cover over your pool as often as possible. Thoroughly clean your pool filter at least monthly. Clean a sand filter by backwashing: Reverse the flow of water through the filter for 2 to 3 minutes until the wastewater is clear. Tips & Warnings Don't add harsh chemicals to the water through the pool skimmer, as that could damage the equipment. Take water samples for testing from at least a foot (30 cm) below the surface for a truer reading. Chlorine also comes in a more expensive but convenient liquid form, and in tablets and sticks that you place in dispensers to slowly dissolve.
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