Snowflake, I just had that last week. I used the super shock and swim. I used a double dose, changed the filter, put in 4 chlorine tabs an put the cover on. The next morning the pool was from green to just cloudy. Last night it was clear. I just have one of those pop pools. 900 gallons. I can not forget to over it at night, or forget to add the chlorine. I also was not shocking it at first because the directions are for a 10,000 gallon pool. After doing the math, which was a pain, I needed to use 6 tbsp for a double dose and 3 for regular. I put the rest in an air tight container. Don't o vinegar. You can use a cup or 2 of straight bleach to get your chlorine ppm back up as well.