Congratulations! Aren't you glad you did it? Try the calcium hardness test again. If the first color never reacted to red, it probably means your water is very hard.
Not quite ready to add cya yet. First you need to change the sand in your filter as that baquajunk really gums it up. After that, then you can add cya (stabilizer). You can usually buy it at Walmart, Lowe's or Home Depot. If not, get it from a pool store. It may be called stabilizer or conditioner. If the ingredients say cyanuric or isocyanuric acid, it is what you want. Add enough per label directions to get to an initial reading of about 30. Add it directly to the skimmer while the pump is running, and then don't retest for it, add more or backwash your filter for a week to give it enough time to dissolve completely. (Don't broadcast it across the pool like some directions tell you to.)
Most importantly, YES TO SWIMMING! But, wear old suits. Cl of 15 with no cya may do some fading of swimsuits. Let your cl drift down and for now maintain it between 3-5. You may find that until your cya dissolves, that you have to test and add bleach morning and evening to keep cl in there. After it starts to dissolve, you should be able to just test and dose it in the evenings. Keep an eye on your ph. It is OK at 7.2 but if it goes any lower, you'll need to add some Borax and bring it back up to 7.4 -7.6
Have fun. Post some pics for us to see.
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