Could be many things.
1. Tell us what kind/size of pool you have and the make/model of your pump and filter.
2. Buy a cheap OTO-phenol red drops kit and 12+ gallons of plain 8% chlorine at Walmart.
3. Add 4 gallons of plain bleach this evening for EACH 10,000 gallons of water in your pool. Test in the AM with OTO. Maintain a DARK yellow reading each AM. Test FC/CC levels every other day. Continue dosing like this, till the CC level is less 1 ppm or less.
4. Test and report your CH (calcium hardness) readings.
5. Tell us what all (make/product name) chemicals you have added this season.
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