You could just be lucky, but without test results I don't know. The fact that the water tastes metallic opens some not very good possibilities.
Do this:
1. Report what chemicals (brand/product name) you've been using, and what test results you've gotten show (actual numbers).
2. Report what kind of pool you have (size, shape, brand, gallons).
3. Go to Walmart and get a cheap OTO / phenol red drops kit and test your pool water. Also get 2 boxes of 20 Mule Team borax for every 10,000 gallons of water in your pool.
I'm concerned that your pH may be VERY low, which can be very damaging to your pool. A very low pH can lead to a metallic taste in the water.
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