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They sell it for 2.99/gal and occasionally have coupons and sales. Might be a good source for you in the future.

The "other" ingredients are water and a dash of lye. It's the same stuff you would buy at the pool store. No worries at all in using it. Enjoy your free stuff. In checking it seems that there is an Ollie's near you in Ft Myers. Perhaps your friend shops there. ;-)

It's 10%. Bought the same stuff from Ollie's. I think the date code (from what I can see is 19 120s?) is fresh. Should be nearly full strength remaining if so.

Hi there! Unfortunately we can't help you by relying on test results from strips. You need to purchase a high quality pool test kit such as the Taylor K2006C or the TF-100. See: Test Kits Compared - Trouble Free Pool It would also help us to help you if you update your signature with...

If you want something integrated into your pump system, the Pentair intellipH is nice https://www.pentair.com/en/products/pool-spa-equipment/pool-automation/intelliph_ph_controller.html

Alkalinity and green hair are unrelated. Red herring. The recommended alkalinity levels from the pool store and industry assume you are using acidic tablets. If you use liquid chlorine, you aren't constantly adding acid to your pool. That's why you can run a lower TA if you use liquid...

Mariane, HEB is a chain of grocery stores located in Texas.

Their website has a link to a YouTube video about "How It Works" that says it uses an ion generator to kill bacteria and algae and your filter traps particle debris. No mention of any oxidizing agent. I imagine it also will cause copper to build up in the water.