Hi Kelly!
It really sounds like you have a few things happening at once, and perhaps a bit more to learn, so some of it will require some TFP "Pool School" reading to build on your foundation of learning. But I'll try to help you with a few things:
- FC (free chlorine) - best to simply use regular bleach (HEB Bravo or Wal-Mart Great Value). Use the Poolmath calculator (link below) to assist in dosage. Ask if you need help.
- Stabilizer.. did you ever add any? Stabilizer (CYA) protects the liner and swimmers from the harshness of chlorine. It also serves as a form of sunscreen for your chlorine to last longer.
- pH must always be in the 7.5-7.8 range.
- We generally never add anything directly to the skimmer. Many chemicals are either too potent or thick to go straight to the pump/filter like that. Add bleach slowly near a return jet with pump on to mix and/or assist by stirring around with a brush.
- Debris that gets water-logged and sinks needs to be vacuumed-up. For a simple AG pool there are several simple vacuums available to do that.
- Most important .. how are you testing your water? Only strips? That is very important Kelly. I would highly recommend either a TF-100 or Taylor K-2006C. In a pinch, for a few days, you can get a Wal-Mart 6-Way test kit (drops never test strips), but that won't last long.
- Also try to add your pool info to your signature for us to see on every post. It helps.
Summary - If your water is crystal clear (no cloudiness or algae), validate or increase your CYA to about 50. FC should be increased with regular bleach and be around the 5-6 target. Never let your FC go below 3. PH should be in the mid-7s. Let us know if you have more questions.