That's common this time of year. There are multiple possible causes.
One of the most common is elevated stabilizer levels, from the use of trichlor or dichlor (ie, the chlorine in most X-n-1 products) without compensatory adjustment of chlorine levels. If you don't know what your stabilizer level is, and aren't sure what 'flavor' of chlorine you've been using, this is particular likely.
Another common factor is the use of all sorts of 'miracle pool additives', which combine to turn pools into disgusting cauldrons filled with a witch's brew of who-knows-what.
The simplest fix -- for small pools that can be drained and refilled safely and cheaply, is to do just that, and then start over following the 'BBB Method' -- basically, just accurate testing + use of ONLY basic chemicals + regular appropriate dosing.
Either way, you need to be able to test your pool appropriately: if you are in a hurry, get a HTH 6-Way Test Kit (~$23) (made by Taylor) from Amazon or Walmart . . . to start. Do NOT use the stabilizer / CYA test until AFTER you've added stabilizer. There are only 3x tests for CYA in that kit.
But, you'll also need the K2006 if you don't already have one.
Also, if you want to 'get it all' now, you'll also need refills for the CYA test: 16 oz bottle of R-0013 and Disposable plastic lab funnels. Try to order from Amazon rather than a 3rd party: Amazon handles shipping and warranties MUCH better.
Once you have test results, post that PLUS info about your pool size, filter type, etc and I'll take a look.
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OR . . . you can just go to your nearest pool store with a water sample. They will undoubtedly have recommendations for MANY chemicals you need to correct "water balance", "high phosphates", "high TDS" and more. You can buy them; add them; and return the week following.
Your choice.
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