Hi and welcome to the forum. Hopefully we can help you get your pool ready for those grandkids to swim!
It is hard to know how accurate your readings are when using test strips. But, we'll give it a try. If you really do have a CYA reading of 50, I would suggest taking the chlorinating tablets out as they will cause your CYA to get higher and you don't want that. It would be better for you to just use bleach for your chlorine. In a small pool of this size, each cup of 6% bleach will add approximately 1ppm of chlorine. With a cya of 50, you want to keep the chlorine level between 3-6 all the time. If you let it dip below 3ppm, you invite an algae bloom to come on over and live in your pool.
Your pH is ok, but don't let it drop below 7.0 or the water will become acidic. Keep the pH between 7.2-7.8. If it drops too low, you can use some 20 Mule Team Borax (laudry aisle at Walmart) to raise it. Your alk is a little low. I would suggest adding a little baking soda to bring it up. Start with a one pound box. Check it tomorrow and see how much that raised it. If needed, add more until you get the alk around 100ppm. Don't worry about the hardness reading. You do not need calcium hardness increased in a soft-sided pool. Also, this is a chlorine pool; you don't have any bromine in it. Ignore that reading.
Hope this will help you get started so those little ones can go swimming! Come back if you have further questions.
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