The first thing you want to do is hit it hard with bleach, and keep hitting it until the water clears! What do you have for a test kit? Even if you have a bad test kit, you can use the color of the water to determine the shocking (until you get a good kit) - hit it hard with bleach until the water starts to become clear, then you'll need a FAS/ DPD kit to complete the process.
Good luck!!
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