You should always check that your chlorine level has dropped back into the recommended range 1-3ppm. You can do this by using a test kit. When you shock a pool the chlorine goes sky high. Wait until it has returned to the correct level.
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With the exception of superchlorinating (which requires waiting until the chlorine level drops to recommended levels), you can generally use your pool when the chemical is dispersed throughout the pool. Fifteen minutes to one hour is a good rule of thumb.
Superchlorination, the addition of large amounts of chlorine, has some drawbacks. Because it requires large amounts of chlorine, it can damage liners and swimsuits and upset water balance. Additionally, it is difficult to determine proper dosage amounts and it requires swimmers to wait until the level of chlorine drops, often a day or more, until they can swim.
After you shock your pool you have to test the water to see when the chlorine is at a safe level 1-3 ppm (parts per million) but a good rule is overnight. you should really test it test kits can be picked up at any pool store or even Walmart or Home Depot
When the chlorine reading is in the normal range - about four hours is Ok with filter running- just be careful for small kids whose eyes may become red or burn a bit. In that case 8 hours is sufficient - if u do it at night then next day is fine.
Waiting to enter pool after shocking will depend on the resulting chlorine level. Add shock ,allow to circulate for min 30 min. Test chlorine levels, if less than 5 ppm swim if higher .......wait , test again. If levels have not fallen to 5 ppm or lower add sodium thiosulfate to reduce chlorine to 5 ppm or lower.
When the chlorine reading is in the normal range - about four hours is Ok with filter running- just be careful for small kids whose eyes may become red or burn a bit