Honestly, with only about 1,200 gallons, it would be easier to drain and refill than fix your water. Probably cheaper, too.
But . . . before you do, you need to do it right:
1. Use a mix of dichlor and bleach to add chlorine + stabilizer (dichlor), and chlorine along (bleach)
2. Stop using whatever is adding alkalinity. It's not getting in there by accident.
3. That is, assuming that it IS alkalinity. Test strips are better than they were, but are STILL 'guess-strips' for several important measurements INCLUDING stabilizer. Unfortunately, you need the SAME test kits as a $250,000 pool! I can't fix that. You can start off with the $23 HTH 6-way from Walmart or Amazon.
The FAQs in the Intex section will put you on the right track!
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