Do the math — don't guess your pool shock.

Multiply length × width × average depth × 7.5. That gives you gallons. Then read the shock label for the dose per 10,000 gallons.

Guessing is how you end up with algae (too little) or bleached hair (too much). Not worth it. Average depth is (shallow end depth + deep end depth) / 2. If your pool is weirdly shaped, break it into rectangles and sum the volumes.

Most granular shocks call for 1 pound per 10,000 gallons to raise chlorine 10 ppm. But you should test your water first. If your chlorine is already at 3 ppm, you don’t need a full 10 ppm shock — something like a “super chlorinate” level is usually 5–10 ppm above normal. A good test kit tells you where you are.

Your pool doesn’t care about your ego. Just do the math.