1. Your pH to TOO low, possibly VERY low. Acidic pool water can definitely cause a rash. And, with test strips, there's no way to tell how low. Go to Walmart and buy 1 boxes of borax per 1,000 gallons of pool water. Add 1 box for every 2,000 gallons (not, 1,000). Wait 12 hours, retest. Repeat if pH is still yellow. Buy more borax if needed.
2. While you are at Walmart, buy fresh filter cartridges if they have them. If not, order some from Amazon. (see FAQ in section I've moved this thread to). Change the cartridge. Run your filter -- with or without new cartridges -- 24/7 till water is A-OK in every respect.
3. If Walmart has the HTH 6-way drops kit, buy one. If not, order the K2006. (Links for all this, below).
4. While at Walmart, buy 1 gallon of Pool Bleach or 2 gallons of PLAIN household bleach per 5,000 gallons. Stop using any 4-n-1, 5-n-1, X-n-1 voodoo everything chemicals. Use bleach to chlorinate. BUT I need to know your stabilizer (CYA) level to know what level of chlorine you should use.
WalmartPool Essentials Chlorinating LiquidAmazon
Great-Value-Cleaning-Bleach-128-fl-oz/
20-Mule-Team-Borax-Box
Get a HTH 6-Way Test Kit (~$23) (made by Taylor) from Amazon or Walmart . . . to start. Note that there are only 3x tests for CYA in that kit.
And you'll need the K2006 if you don't already have one.
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