We do not "shock" our pools. We follow the SLAM Process and we do it using bleach. Here in AZ with hard water and high evaporation it is not a good idea to add calcium to the water either.
What kind of filter do you have?
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We recommend backwashing when the pressure rises 20-25% over the clean pressure. If your clean pressure is 13psi, you should backwash at 16psi ... so you are well past due.
You need to properly follow the SLAM process to confirm there is nothing in the water.
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