Add a metal sequestrant first.

Probably. Well water often has iron, manganese, or calcium that will turn your pool green, brown, or cloudy the second you add chlorine. Skip the shock and handle the metals first.

Fill the pool, then test for metals before you do anything else. If iron is present, add a sequestrant—something like Metal Magic or Stain Free—and run the filter for 24 hours. Without that step, your chlorine will oxidize the metals and you’ll be fighting stains and discoloration for weeks.

After that, balance pH (7.4–7.6), alkalinity (80–120), and calcium hardness (200–400) like normal. Well water tends to be low in pH and alkalinity, so expect to add soda ash or baking soda. Don’t rush the shock—wait until the sequestrant has circulated and the water is clear.

One more thing: if your well water has high calcium, you’ll see scaling on the tiles. Keep an eye on calcium hardness and use a scale inhibitor if it’s over 400 ppm.

Your pool will be fine. Just don’t skip the metal test.