As long as you don't have stabilizer in the water, the sun is going to deplete your chlorine. Try adding your dichlor tonight, then measure your chlorine after the sun is off the pool. In the morning, measure the chlorine before the sun hits the pool. This will tell us if there is something in the water eating the chlorine, or if the sun is consuming it during the day. If the loss is to the sun, then you simply need to add chlorine at some point during the day so that it never goes to zero. Once you have some stabilizer in the water, then you can dose the pool daily and should be able to maintain the levels you want. If the loss is overnight, then you have something in the pool that needs to be killed, and that's accomplished by shocking the pool.

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